Uh, he didn't say that all videogames have to lack depth, or that there shouldn't be games that cater to different tastes. The truth is that the industry is in a narrow spectrum NOW, and by catering to more groups that widens the spectrum.
Seriously though, the idea that catering to a wider audience means less depth is a total fallacy. Older people enjoy movies and books with as much depth (perhaps more) as ours, why would games for older people automatically be less deep?
Your problem is you've only seen the downmarket of this audience. They've never been catered to and thus never had a chance to upstream. You have, but you were downmarket once too. I'd bet that the first game you ever played was alot simpler and more accessible than the games you play today.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.
