Can you think of a new iPhone Apple introduced that didn't have some kind of revolutionary new breakthrough technology? It's really unfair to say Apple isn't pushing the envelope that much. Every new iPhone brings something remarkable to the table. I'm 100% sure we won't be disappointed this year with the 5S.
Someone's been drinking too much Apple Kool-Aid
Seriously though, I love Apple but even I can see that the 4S and possibly the 5 were incremental upgrades at best. The 4S bought Siri... which still is a beta.
I definitely think that it's fair to expect a little more from a company with billions upon billions in the bank. I'll still buy iPhones, but they seem to always be catching up now rather than pulling away.