This only my opinion but given the Multiverse is infinite and well Doctor Strange 2 can only show so many universes and I think they should lower it down a little bit given there is only so much you can show in 2-2.5 hours. (let's face it isn't Endgame so it has to be less then 3 hours) That is why I think it is best they stick with the comics universes, What If...? scenarios, and alternate MCU's. Basically skipping the old non MCU stuff that has zero connection to the MCU aka the non Marvel Studios produced stuff. Why am I saying this you may ask well for a few reasons, one it may be a Multiverse film but there is still a budget $170 million estimated that is half of Endgame and closer in budget to Doctor Strange 1 meaning they can't pay 100 actors especially from the old franchises because some will demand a lot of cash. Another thing is some either don't want to be there character again i.e. Hugh Jackman. The final thing is it would be copying there rival as they did something similar back in 2019 and it was successful and last I checked Marvel Studios was not trying to copy there arch rival. Let me know what you think in the comments below.