I'd disagree with that for one reason: it's now a beefed up Beast Boost, aka it's lost on swapping out. And it doesn't come with the free buff on Water Shuriken either.
Ofc I may be wrong, but I hardly see Battle Bond really being used over just protean, you don't have that payout of "I have the transformation, now even if i'm forced out I have that scary wincon in the back the enemy has to play around".
Expecially if you're choiced, it'll be very easy to abuse and force it out, unless you're cleaning lategame, in which case you've already won most of the times.
I'm really skeptical that Greninja will make a splash when Cinderace and Meowscarada do everything he wants to do and better... except setting spikes I suppose, but Cinderace provides one of the very few easy to access hazard removals so...
I'm betting on Greninja joining Blaziken in UUBL