Chronologically, more good ideas stick around than bad ideas, as the game goes through cycles of development.
I'm not at all sure about that. It seems some pretty maladaptive ideas, that the designers knew were maladaptive at the beginning of the process, have flourished (long combat time, I'm looking at you).
It would be cool (for some) if that evolutionary metaphor really worked -- then you could say that what you liked was objectively better (if newer). I, however, think a genetics lab metaphor might be far, far more appropriate. Yes, you can create corn that won't reproduce itself.....but you need to control the environment, and you need to create new seeds constantly, for it will not become self-germinating.
As wild strawberries are better than commercial ones, and as normal watermelons are sweeter than seedless, the goals behind a commercial venture are not always to produce the best product, but rather the product that will generate the most revenue.
That's not evolution of quality for the gamer. That's an experiment in logistics for the gaming company.
Moreover, each game is created with a particular
philosophy of what is best in gaming in mind. The creators of 4e, for example, were more than happy to tell us what fun is, and what unfun in. The problem is, not everyone agrees with their ideas of fun and unfun.
Both 3e and 4e have some interesting ideas. 4e did away with some of 3e's interesting ideas. 3e did away with some of 2e's interesting ideas. And so it goes. Not better. Not an evolution. Just a change. And, like speciality bred dogs, a change that is less likely to survive if cut off from its' master's loving hand.
If, 25 years from now, 4e has the kind of healthy community that 1e does
right now, I'll happily say that I am wrong. Heck, if 4e has anything like the market share in 10 years that 3e/Pathfinder has
right now, I'll happily say that I am wrong. But I don't think either of those things will occur. Not by a long shot. And I very much doubt that the lead developer of 7e will still play 4e avidly.
RC