Actually I don't know why old coins without important innovations like doge and lite have survived despite their limitations. Perhaps their only advantage was their early adoption in the altcoin economy, but I have no doubt that sooner or later will be gradually displaced by better coins.
Uhhhhh, the same could be said for Bitcoin at this point. If it wasn't for the first mover market advantage and network effect it would have gone tits up by now.
When you say "better coins" do you mean the centralized ones of the premined ones or both? Maybe the IPO coins?
If you do your research you'll notice a pattern/theme going on here... so many coins out now pushing whatever features for quick profit.