As somebody who just cancelled my WOW account, I'll agree. I think WoW not only impacts tabletop RPGs but also other tabletop games such as board games and miniatures games. I picked up WoW for various reasons:
1) First off, cost. A WoW subscription costs me 14 bucks a month, that's it. Nothing more. I already have the computer and the ADSL connection which I use for other stuff.
At the time I switched to WoW, I was really into 40k. The game design behind 40k was(still is?) however pathetic and Jervis had just pulled his little stunt with the Dark Angels codex. I figured why waste large amounts of money every month on a poorly designed game and miniatures that take me ages to paint, which are just going to be made useless because of some unprofessional idiot who can't design properly?
I could get endless entertainment for my 14 bucks a month from Blizzard with no other effort or prepwork on my part.
Blizzard actually does try to make a quality product. They're a big company, they test their stuff, they market it well. Most tabletop game companies (rpg or minis) are fairly relaxed, virtually mom and pop corporations. It's in fact quite astounding how unprofessional GW are.
FFG is one of the few tabletop game companies I know of that can actually compete on the same level as Blizzard for sheer professionalism, excellence and polish.
This is a tough one. WoW to some degrees does require certain commitments to get the most out of it. Raiding requires you to be mildy focused, pitch up on time, prep beforehand etc. Blizzard is rapidly trying to reduce this as much as possible though. Soon you'll be able to hop into a 25 man raid pretty much at a moment's notice, without any prep, and simply roll your face across your keyboard before collecting your 'phat lewts'. (This incidentally is why I no longer have a WoW account.)
The majority of people considder this a plus, I don't. I feel more rewarded when I put in some work for something. Took me long enough to learn that though. I doubt, from experience, that many other people will feel the same way.
It's much easier to get a group to do something in WoW than it is to get a group together for an RPG or tabletop game. There's a much larger pool of players. Everyone I know that plays tabletop games can only play one night a week and it's like herding cats to get them all in the same room.
WoW has a much larger pool of players to choose from. If I don't like somebody, I don't generally have to put up with them just because I need another player.
All in all, I'm really worried that the direction of popular entertainment today is going to have a very bad effect on the tabletop games industry. Everybody nowadays wants things faster, easier and with more flashy audio-visuals. Tabletop games are rapidly being left behind by technology (which to some is part of their charm - charm unfortunately doesn't sell that well today).
I really wish I could see a solution. One thing I can say though, is that the unprofessional approach so many offline games companies present today isn't helping things much.