Technology usually renders things obsolete in 6 months time. Since Smartphones/AppPhones are a burgeoning market, expect that window to be smaller. So, to answer your question: yes and no.
Yes, the Google phone is an interesting proposition and its a huge risk that Google is willing to take to revolutionize the cellular industry. No voice plan?! What?! But yeah, a 100% data phone with voice over data! In that way, yeah, your phone is antiquated. I mean, who wants to pay for a voice plan AND a data plan? The future is all data.
No, voice plans will not go away. Until data coverage is near or approaches voice coverage, it is unlikely that it will viable outside of major coverage areas. Could you imagine trying to make a phone call where there's no data coverage? Sorry!
If you're talking about hardware: The specifications are basically identical. 3.7" screen, tightly packed pixels. The 1GHz Snapdragon and the DROID's 550MHz OMAP are virtually similar in performance, although OMAP has tested to be better at some things and Snap better at others. Different yet the same. So, again, not obsolete... yet.
The Snap going into the gPhone and HTC's flagship Android phone is the 1GHz processor using 65nm technology (old). However, they have a Snap 86xx that's clocking at 1.5GHz using 45nm technology (new) and that's not in any smartphones yet. That being said, OMAP has a whole line of faster clocking processors that haven't been implemented in AppPhones yet either. So, in due time...
Snap will advertise 1GHz phones in a month or two. Give it another 4-5 months before the next OMAP 1GHz phone comes out. And so on and so on... What you need to do is stop thinking you need the biggest, baddest tech on the market because you'll always be wanting more and more, spending more and more money on things that go obsolete, inevitably.
I find that people who do that are compensating for some sort of deficiency *cough* *cough* and need to prove to their friends they got something others don't (see iPhone fanboys).