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Some of those ideas might've sat well with me. Following Hunt post Halloween 2 or Tom Atkins character post Halloween 3 after all the kids die off that watched TV. Those might've been fun if done right.
As it is, just let em die. A crossover with Mike/Jason is sure to be a money maker., but directed by someone who has no idea what the franchises are about, like the guy who did Freddy/Jason. While Freddy/Jason was a fun time waster, it was silly and made up shit as it went along.
Mike/Jason would make more than Mike/Freddy, especially since I think Englund is done, despite being the only guy I'd want as Freddy. Without Englund, I can't imagine many being seriously interested in Mike/Freddy. If they did Mike/Jason, just have Hodder play Jason as he's considered the definitive Jason by most, no matter the opinion of content. Have a 100 year old Nick Castle play Mike and that's it.
All that said, retire the guy would be the best choice, but its not gonna happen me thinks.