This lack of senior developers also leads to the chronic amnesia our industry has, that includes reinventing the wheel every 10 years (same wheel different color). The more the things change the more they stay the same.
I'm on my late 20 and I went to my alma-mater library once a week in the past. I grabbed old books (Liskov, Bentley, Kernighan, some of the software engineering books, etc) a few times and I was surprised to see methods or techniques that people use these days and considered cutting edge were being discussed in a THIN, DUSTY, paper with YELLOW-ish color books.
There are plenty wisdoms in those old books yet these days people were gung-ho with the latest greatest.
I'm not saying that the latest greatest aren't advancing our thought. It's just that there are more noises than actual wisdoms.
More people would be better off doing their 10 000 hours of practice before raising their voice in an opinion.
That said I always thought the guild model of apprenticeship would be a better model for developing our craft. But I'm not sure how one would go about setting something like that up.
Might be worse in tech because you can reinvent the wheel, with less physical infrastructure that has to stay around. Or maybe that makes it better. I started writing up something about some of my experiences with institutional amnesia causing problems when you still have the old wheel around, since old factories don't go away easily. But it ballooned into a much longer story so I threw it up somewhere anonymous and submitted separately: http://news.ycombinator.com/item?id=3311015
At a certain point, you realize that people in tech are constantly promoting the holy grail. So you buy into it, learn it, and then see that it has different, or even very similar weaknesses to the old tech. Also, you begin to realize that domain experience is a very powerful thing.
So, I would rather be happy, operating in the 'zone' with the platform I know, doing 20% more work to hack around sub-optimal language feature, than spend time in distress, trying to wrap my head around a completely different platform, all because someone on my team is obsessed with the new flavor.
(for the record, I've been on both sides of this)