I agree with Brent. When have you ever heard an announcer saying, "He's going to try to put as much spin as he can on this shot" ? It's always the opposite: "He's got to be careful not to spin this one off the green. He's going to try to take his wrists out of the swing and put as little spin as possible on the ball."
Now, that excludes lies from thick rough, of course, and sometimes the greens are so hard that no amount of spin will keep the ball from bouncing long -- even with today's deep grooves. My guess is that the groove change won't hurt these guys much at all, and the ball will continue to soar.
(Not being a pro, I've bought three Vokey wedges in the past year, because I need all the help I can get stopping the ball. And they do help.)