Looking the pace (and relative ease) of Android application development, I have little doubt that video conferencing, web chat, video telephony, facial recognition, and other applications will be forthcoming. Its simply too enticing of a feature for developers to ignore it, especially since more and more phones are going to include the feature from now on.
I understand the coverage concerns; they're legitimate for anyone not in a 4G market. I'm lucky enough to both live and work in the heart of one of Clear's most developed cities, so its really a no-brainer for me.
So even if the Evo is relegated to 3G, its hotspot feature is still better than any Verizon phone (8 simultaneous devices). Can you tether on Verizon? Yes, but to do it legally is expensive (more expensive than Sprint). You can do both illegally, but again, the Evo is simply more capable. And when you are in 4G coverage, throw the comparison out the window -- the Evo delivers broadband speeds. Everyone in the Starbucks will buy you a latte to get on your 4G hotspot.
Phones these days last 12-18 months for early adopters, such as most of us in these forums. Verizon isn't going to have a LTE phone any sooner than 16 months from now. I view the EVO as the bridge phone to get me to the time when all carriers have 4G options -- then I can reassess. Until then, the Evo will be the fastest phone. Period.
Phone choices are personal, so be happy with what you choose. You
will have a share of buyer's remorse when you see someone rockin' a new Evo in June. But such is life in modern times.