I don't think PUSA is releasing the special movie cards anytime soon, unless it's REALLY soon and they're just promo non-usable cards, because the LV.X stuff is getting cycled out and they're focusing on Prime and LEGENDS.
Why would that be bad? It would be the same situation we're in now, where like 60% of people use SP decks, and the other 40% use other decks. Now it would be 60% LW and 40% Other. I personally would like the change since I DESPISE SP decks with a passion!
But just think about it. If you had Curse-Gengar out KO-ing a Stage 2 LV.X-ed Pokemon (not sure about Dusknoir LV.X) you could switch back to Gengar Prime sending 4 Pokemon cards to the Lost Zone with the effect of the "Lost World" Stadium card. That's the basic stage, stage 1, stage 2, and the LV.X. You would only be two cards away from winning! And if you combo it with Mr.Mime and Gengar Prime's attack then you could easily send two more cards to the Lost World from your oppoenent's hand. That's game win from 0-6 in two attacks, TWO! That's why everyone is into Lost World decks. BUT, since we don't have the essential stadium, Gengar Prime along with the other Lost World based cards will not be used at all. I'm thinking a huge storm of Machamp Primes will be seen.
ALSO, you can counter Lost World easier than SP, since all you have to do is remove the Stadium card before the meet the requirements. So, much more fair opponent than SP decks.