Actually, Avengers can be crossed over with ALL THE THINGS (and Transformers are actually canonically part of the Marvel Universe) ever since the MCU was acquired by the House of the Mouse and thus put the Marvel Universe potentially in range of the Kingdom Hearts franchise. Now, there's a massive fangirl meltdown in potentia... presumably the main reason it hasn't happened yet is due to noise ordinances (the volume of squee would probably breach regulations in most parts of the world).
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Actually, Avengers can be crossed over with ALL THE THINGS (and Transformers are actually canonically part of the Marvel Universe) ever since the MCU was acquired by the House of the Mouse and thus put the Marvel Universe potentially in range of the Kingdom Hearts franchise. Now, there's a massive fangirl meltdown in potentia... presumably the main reason it hasn't happened yet is due to noise ordinances (the volume of squee would probably breach regulations in most parts of the world).