To me it's an Elseworld's take on the Castlevania mythos, nothing else. Just because it's a new timeline doesn't mean the original one doesn't exist anymore.
Exactly. So why some people crying over changes in the different timeline? Your favorite old good, covoluted and the same time unfinished timeline is still there, with your favorite characters and other stuff. Why it's neccesary to hate other one?
It's hard to even talk about the likes of Brauner, Cornell and Olrox now cause they exist in multiple universes. No need for that. KTHNXBYE.
CV64 / LOD and COTM already were other universe. Temporally though, because IGA decied to let them be in his "glorious" timeline. Also he didn't feel need to explain how poor Dracula was revived almost like six or so time in a span of 100 years, but whatever. All in all it is not new concept for the series, so there is no sense to hate idea about multiple 'Vanias universes. If anything it is a good idea, so creators could take series into different directions and fell limited by restrictions imposed by story (and it's fans, though they will complain anyway, seemingly just because).
its just doesn't feel right at all.
Very convincing and reasonable explanation of your motivation. :

Belmonts and Dracula are arch nemesis. Not part of the same family.
Old timeline rules not neccesary applicate to the new one.
And besides idea about Belmont and Dracula being related seemingly was in the air since Symphony of the Night. Moreso after Legends. So it is nothing new for the series. Again.
If MS or any other team, who'll try to use this idea, will be able to excute it succesfully, then I'll applaude them. It's not like they story renders everything that was before obsolete. Though it is exact reaction I observe, when people talk about separate CV'verse. Go figure...
doesn't matter that they are more powerfull then the average human they are still HUMAN and i think it should stay that way
Technically there are humans. Going by they powers there are not. More like powerfull mages or something like that. So...what difference it'll make if they become "Dracula related Belmonts"?