There is a very reason why Studio Series was made. I seriously needed the cause to explain why all the information i read treated the first movies as something "classic" or "in the past" (that it's not in day anymore these times). So i guess it was because of that, yes, Studio S line was under the pocket of hasbro and they just delayed it, they wanted to see how TLK could did in toys (and it it decently, however, the movie's perfomance in theaters it just flop), it would be a suicide move to release their tribute line at the same time we got TLK, that's why you can see in the original pictures how the dates were stated tor March-April. So probably Hasbro feared about that and delayed it to release it this year, and the first two MpMs did so well, that Takara it's focusing on them now, for the more adult collectors, and probably ironhide and ratchet will do the same but better. Even with a reboot, the MPMs will be needed for that. TL;DR Movie toys are a success, Hasbro would be an idiot to scratch them.