I don't think they would really have enough time left before movie 3 to make T-cracker and Skywarp, unless one or both of them end up in multi-packs. And with TC already in Generations, he may be less likely to be produced. Then, of course, they may stick one in RtS or throw it in the next classics installment. But you can't make two without the third. Either just Sceamer or all three in my opinion.
I think we'll still see one.
The game wasn't a smash hit, but it was still enough of a success for a sequel. Video game sequels can be cheaper when you borrow things from the first game, such as character models. I really doubt any characters getting new forms. So the WFC seeker mold will be the same.
I'm sure we'll get it evetually.