headmasters would be cool if they marketed it as a joint tech venture between the autobots and human military to combat the decepticons...
I reckon any other Special Team-like combiners will just be pissed up against the wall like Devastator was. Certainly it would make the public feel better about the Autobots if they were seen to be piloted by humans. That would be the oficial public face of any TF/human pairing: Autobots under direct human control. Of course the reality would be more a partnership between a TF and their human companion. Or as probably presented in the movie, the human and their Transformer companion. It could bring in more TF scenes since they'd be paired with humans and humans get the lion's share of development in thse films, or it could just mean a lot of humans sat in alt mode TF with the TF being silent while the human completely takes over the TF role too.
Combiners YAH!! I m guessing after Devastator anything s possible in a TF movie and I d love to see Menasor!! 4 sports cars and one big ass truck, hell yeah and since we only have Shockwave, Soundwave, Meg and that armored truck officially confirm and spotted on set (no news on Starscream actually) 5 more wouldnt hurt.... Bots are like around 10 already lol