Spring Regionals? That's months away, there's no way people know what the metagame will look like then. It could be anything really...although yeah, EX's are going to always be big.
Emboar will never be good, it just requires too much to work. Blastoise only works because of Rush In and the fact that Keldeo EX is such a godly attacker.
I would suggest waiting a while before deciding what people will play. Heck, we don't even technically know what cards are going to be in Plasma Storm yet. As of now, based purely off Japan results (which aren't accurate but just for the sake of this argument), the game will pretty much stay the same, except everything not named Blastoise is going to include the Hypnotoxic Laser/Virbank Gym Combo, and Blastoise gains a new friend in the new Black Kyurem EX (the Black Ballista one). However, again, any speculation is silly because we don't even know the full set yet, much less what the metagame will look like.
Emboar will never be good, it just requires too much to work. Blastoise only works because of Rush In and the fact that Keldeo EX is such a godly attacker.
I would suggest waiting a while before deciding what people will play. Heck, we don't even technically know what cards are going to be in Plasma Storm yet. As of now, based purely off Japan results (which aren't accurate but just for the sake of this argument), the game will pretty much stay the same, except everything not named Blastoise is going to include the Hypnotoxic Laser/Virbank Gym Combo, and Blastoise gains a new friend in the new Black Kyurem EX (the Black Ballista one). However, again, any speculation is silly because we don't even know the full set yet, much less what the metagame will look like.