Your mother's blog post is mostly about salary, which seems to be beside the point. There's more to life than money.
If your long-term goals include (or will ever include) "Start my own company," the odds are overwhelmingly not in your favor. First, when you're in university, you have a unique opportunity to become known as the smartest person in the class, and thus build a ridiculously valuable network. But you could do that at work too, right? Well, not really. There are legal issues at play: it's not so easy to just pack up with a coworker and start your own company. California makes this easier, but it's still hairy. Whereas you almost never have to worry about that as a student. Plus, your student network will be gigantic in comparison to a network you can build from work alone.
Someday you'll be old, and without a degree you'll be doubly vulnerable to ageism. If you're not a manager by then, you may be out of a job. While it's nice to think you'd be retired by then, reality has a funny way of making that unlikely. In particular, if you meet someone and fall in love, your finances and other ambitions tend to become affected.
You may be interested that I once interviewed at Justin TV, which eventually transformed into Twitch and was recently sold for a lot of money. Maybe I would've had an equity stake, maybe not. I didn't make the cut. Official reason for passing on me? Kan met with me and said that his investors recommended they not hire anyone without a degree when they were in such early stages. Now, that could have just been a convenient social excuse; at the time I remember not really demonstrating enough value during the interview stage, otherwise I'm sure that wouldn't have stopped them. On the other hand, if I was a borderline "hire" with a degree, then maybe that would have been enough to push me into the zone of "Let's try this person out and see how he does," which would have let me demonstrate my abilities directly, rather than by solving interview puzzles like "how would you implement a way to evaluate 2 + 3 = 5?" (At the time, being self-taught, I wasn't very versed in lexers, parsers, etc, so I had to flub my way through that particular question.)
You can have a wonderful life without a degree, but the vast majority of startups are started by people who went through universities. You know how Sam Altman has given a series of wonderful lectures at Stanford? Pg has also written at length about universities and startups:
https://www.google.com/search?q=site:paulgraham.com+startups...
I've claimed that the recipe is a great university near a town smart people like. If you set up those conditions within the US, startups will form as inevitably as water droplets condense on a cold piece of metal.
I've been operating under the assumption that you moved out to SF to go live the startup dream. The fact is, that dream is much less likely when you haven't attended university. It's unlikely in terms of raw statistics (I'm personally aware of only a few people who have made a successful startup without having been through university, tptacek being one of the notable counterexamples) and in terms of your network. As a student, you're a potential founder. As an employee, usually you're going to remain an employee.
Isn't it interesting that Loopt was objectively not as big of a success as once was hoped, but Sam still succeeded brilliantly from it? I wonder if his network had anything to do with that, or the fact that he attended a top-tier university?
By the way, if you don't really care about starting a startup, please just disregard everything I've said, since your current path may in fact be optimal, as your parents noted. But if you're going the startup route... Well, "the rest of your life" is a long, long time, yet you only have a very narrow timeframe to reconsider. I hope I'm wrong, though!
One of the most important points that I don't think I stressed enough, which took me a long time to fully accept, is that university isn't really about learning. Not when it comes to software. Yes, your education will be well-rounded and you'll have a much deeper knowledge of architecture and theory and etc, but the primary value to you as a potential founder is the network and the social acceptance that comes from attending a top tier university. Prestige. It's lame to an extent, and maybe someday the world will be different, but that day likely won't be in the next decade, which is the timeframe you care about the most.
Also, consider this: All of the opportunities before you now will still be there, enhanced, after university. Ever play poker? It's probably best to follow the path of highest EV. There's almost no way that university is anything but the highest EV in this situation.
I wish you the best of luck. I apologize for coming across as negative.