I do not know whether there is any actual data to indicate whether 'gamist' play is more common with current editions of D&D than before. People obviously have different opinons based on their personal experience.
Myself, I never played D&D before 3.0. We looked at 2nd ed a few times, but having played other RPGs it just seemed to have so many arbitrary restrictions on what characters could be/do and such a long list of magical powerups that seemed necessary for the game (both from reading the books and anecdotally from people who'd played).
3rd edition seems to me to make it much easier to customise your character rather than its stuff. We have had a lot of fun with it. There is still a huge list of magical items to stack, and now feats and things too. But hey, why is this bad?
* The GMs in all the groups I play in disallow any option which doesn't have a good story backing, and plenty that do if they think it doesn't suit what they are trying to run. No uber builds with 3 prestige classes allowed. We all agree with this because it stops the story getting silly, and we are trying to have a game with a fun and believable story.
* There doesn't seem to me to be anything in the 3 ed books I've read (a fair collection by now) that discourages us from playing this way. Nothing which suggests that we need to have a more effective 'build' or open slather on optional elements. Overall the books seem to me to encourage the DM to be choosy about the options to suit their consistent world.
* Just say 90% of D&D players did treat this as a card game (not that I believe this is the case). Why would this hurt our group? They're having fun, we're having fun, and hopefully the flow of $ from them will keep the industry going so occasionally we can cherry pick an option we like.
(Hopefully the flow of $ from me compulsively buying sourcebooks I know I'm unlikely to get to use will also help.)
OK maybe this is getting a bit long. In summary,
* Is D&D getting more like MTG? I think not, but then I haven't been around it that long.
* If so, would it matter? I think not.
I know from this thread that other peoples M does V, though
Cheers