Well, as a CCG, D20, and MMORPG addict, I'll throw in my 2-pence.
My groups got some hardcore computer gamers, a couple of "casual" computer gamers, and one guy who's got a computer built from my old scraps that kind-of runs NWN. Worst case scenario, we had about a one-month break during open beta of WoW. Now, if we have a session planned, we time our MMORPG playing so that it's not going to interfere. Amusingly enough, the 2 casual gamers are playing WoW with the 2 hardcore gamers, and my buddy's moving in with his brother, who has a system and WoW account...and is playing with us
So, we're still interacting with each other. Still having fun. Just in a slightly different way. I don't think RPG's will ever be "replaced." They can't be. No MMORPG will have, for example, "The Feast of the Gobbler", that awesome free download from Necromancer games. Amusingly enough, my PC's went evil when I ran it for them - which was hilarious, a great time indeed.
And the pay-to-play aspect of MMORPGS - you're paying so that Blizzard/SoE/Mythic/whomever can keep people hired and keep paying for THEIR bandwidth. So far, WoW has been an amazing experience. Does it need some work? Yes. Blizzard's just starting this MMORPG thing, and so far, they've done an amazing job. I can highly recommend the game. Even for non-hardcore players (I'm one of the non-hardcore) you can level up very quickly, and still have fun.
Well, maybe that was more then 2-pence, but, mja
Sio