Darkrai actually takes massive hits from several directions. It not only loses Energy Switch, which significantly hurts the deck on it's own, but it may have some serious issues with Virizion/Genesect, considering it doesn't have all the cool math it normally does with Laser. Blastoise isn't going anywhere - Virizion/Genesect doesn't kill the deck at all. I really just can't see it being very good.
On the note about Cradily, it has two major issues. The first is the set up. If you miss T1 Lileep, you pretty much straight up lose right there, and even if you get it and it doesn't get KO'd, you have to get the Cradily going the next turn. Even after ALL of that, you're still 3 turns behind. That leads to the second issue, which is that Stage 2's right now are kinda....meh. The only good ones need an entire deck's worth of space to function properly and would rather set up without Cradily, and the other ones just aren't strong enough to handle the kind of comeback necessary in Cradily. I really cannot see it being truly successful.
Truthfully, I don't think anything will be BDIF. I think Blastoise, Plasma, and Virizion/Genesect will be Tier 1, but none of them are truly overall better than the others.