You live in such a huge bubble if you think that's a reasonable thing to say.
Yes, us techies enjoy very nice perks and big salaries, due to us working in a hot sector of the economy and whatnot. But the vast masses out there are not so lucky.
At this point, we pretty much have to do whatever we can to get out ahead--so, let's all try to get higher salaries...least of all because whatever work we do is pretty much directly what enables the shafting and monetization of those masses, and once we too hit the bread lines they aren't going to be trying to help us one bit.
EDIT:
I'm not saying let's go smoke cigars and blare "Kill the Poor" out of our Teslas--I'm saying that, at this point, we need to optimize for our sector of the working class. Denying ourselves the chance at higher wages because other people are getting screwed only means we're going to get caught up in the machine too.
If I wasn't a nerdy kid who toyed with computers in school, I'd be in a very different place right now. Once that's much less nice.
(But yes, you're right in principle.)
That's not really what it's about though. The upper middle class is what drives the economy. The super rich are not the job creators, the almost rich are.
You give an extra $25K/year to a multi-millionaire and it changes nothing for them, but to someone making $150K/year they're not making so much that it doesn't affect their spending. And the almost-rich buy services. They pay people to do the jobs you can't outsource and you don't need a degree to do.
So if you want to help the poor, go ask your boss for a raise and then spend the money.
Connecting salary to length of employment is just one way.
A hypothetical new software-themed union could define another scheme for a pay scale.
(And as a side note, for my part, I would rather my salary be defined as simply as "as much as I can get" rather than my skill or my tenure.)