Open-handed playing is something I've been working on as well. The big hurdle keeping me from switching all the way is my left hand's current (in-)ability to play up-tempo ride cymbal patterns (jazz, samba, etc.). However, I've worked up a bunch of Afro-Cuban and Caribbean grooves, incorporating my toms and/or cowbell(s), grooves which really wouldn't have been available to me playing a more traditional crossed-hands style.
And I'm still working on that left hand of mine.
However, I seriously doubt that the open-handed style of playing is going to "become standard," or even something that the majority of drummers will incorporate into their playing. Drummers can be a really conservative lot, especially when it comes to setups and techniques. Players like Carter Beauford have given open-handed playing a lot of visibility in recent years, but it's not anything new - Billy Cobham has used that approach for decades. I agree that open-handed playing offers a great deal of flexibility that isn't available when playing crossed-hand style, but the crossed-hand style has been entrenched for decades. An open-handed approach strikes me as being a much more logical approach to moving around the kit, but that obviously doesn't mean that all drummers will see it that way.
Consider this: a quick look at various drum forums will find many drummers who have opted for traditional grip because (in their words) "it looks cool," which I think is a silly reason to adopt any
technique. (BTW, please don't misunderstand what I'm saying, folks - I'm not saying that traditional grip isn't a valid technique, I'm saying that "because it looks cool" probably isn't the best basis for using any particular technique.)
Some drummers will see what open-handed playing can offer, and they'll give it a try (and possible adapt it into their playing). Others (rightly or wrongly) won't see any benefit to it, and still others simply won't care to even consider a change. That's pretty much the way it is with any particular technique, or any approach to playing a musical instrument.