wave collapse is what happens what you observe the wave function and break the superposition. the many worlds interpretation actually DENIES the wave function collapse. evidently you're not very well versed in QM.

MWI theoretically allows the possibility, just like my infinity baguette interpretation allows the possibility of an infinitely long and thin baguette appearing somewhere everytime a wave function collapses. both are just philosophical interpretations, and there's no evidence supporting either of them.

yes, some renowned physicists prefer the MWI since it removes the randomness and the observer from the equations, and other renowned physicists prefer other interpretations. most physicists prefer the copenhagen one or the "shut up and calculate" interpretation. everyone has their own preferences and that's perfectly normal. Richard Feynman, for example, thought MWI was "ludicrous".

also there's SO MUCH we still don't know about quantum mechanics. things still don't make much sense, and we still have to conciliate it with relativity, finally creating the quantum-gravity theory. there's still many things to discover, and those things will wildly change our understanding of QM. in my opinion, it's likely that neither interpretation is completely correct. we still need to find the missing pieces, and then it'll make sense.

as a sidenote, science has no dogmas. if you want to do mental gymnastics to support your belief that parallel universes exist, then go ahead. but be aware that MWI is just an interpretation among dozens of other interpretations that may not be correct at all, and that there's no evidence supporting the existence of parallel universes. you really shouldn't blindly believe in something without having any evidence, just because it sounds cool.