Shit, if we're pitching ideas for how the movie "should" have been, some of the elements of the script could be the foundation of a good film.
A Predator ship crashlands in an unlikely location for a Pred hunt. A naive wide eyed UFO chaser who thinks they're going to meet up with E.T. gets mixed up with the shell shocked survivor of a Predator looking for revenge, while the military also tries to capture the Predator. Keep the themes of from the first three movies, but flip the script because now the Predator is the one being hunted and its more dangerous than any before because now there are no rules. The gloves are off.
But no we got Monster Squad by way of MCU crap.