Thanks to AOL's ad campaign, I had someone ask me recently whether they needed to get their ADSL service from a particular provider for it to be compatible with a wireless network! I politely replied that any ADSL or cable broadband service will work over a wireless link.
Anyway, to your question: I think that things can only get worse.
11n is supposed to improve overlap, but I suspect that it will not make any positive difference in practice because the signal is much stronger with a longer range.
I'm glad that I don't live in an apartment block or cheek-by-jowl housing estate, where every network is closer to the next.