I want to be able to retire some time early, but almost certainly won't actually retire - I love this occupation too much and would do it for free (well, I actually do that too). But being able to retire is a nice situation to be in, in terms of self-confidence, work-life balance and general psychological well-being.
Which is next? Probably share/investment goldrush. Then gold and other hard commodities when that goes belly up, then we're back to real-estate. and on and on...
Also missed out the travel for a year and see the world while running a blog meme. My personal favorite seeing reality hit and post schedule start to slip Scheudenfreud is awesome :)
Nothing wrong with wanting something different.
Far more desirable to me than finding some golden goose is to find a path that keeps me enjoying work for years and years.
When I read about a programmer who stopped programming at 30 to go into construction, I think that shows programming wasn't really the right career choice for him. If it's not the right career choice for you, then by all means follow the recent spate of HN "retirement" posts and change careers.
But if you love programming, you can actually find jobs you like in programming! You don't need to retire! Talking to 30-somethings planning their retirement is...depressing.
Of course, as with anything, there's exceptions, but I'm convinced that if you keep investing in your own knowledge, keep exploring and learning, and keep figuring out what it is that you'd like to do most, you can avoid age discrimination pretty well. The few 60+ year old co-workers I have confirm this. The large amount of aged Software Superheros out there confirms this.
You sound like someone that's never taken a serious amount of time off work. Two years ago I quit my perfectly good programming job to spend 2 years driving from Alaska to Argentina. Someone asked me what I did the whole time - my answer "Exactly what I wanted to do. Every single day." I encourage you to take a seriously long amount of time off work to discover what you actually want to do with your life if you don't have to go to work.