If they come with the idea that Gabriel is Alucard, I will kill myself. (I won't if IGA is in the castle cave.)
why would they? They made him Dracula...
Gabriel called himself Belmont because he loves mountains. Why can't someone else do the same?
I dunno, I prefer the Belmonts to remain human vampire slayers, ALUCARD BELMONT just sounds retarded.
Alucard was never Alucard's real name. It was Adrian Fahrenheit Tepes.
And considering Gabe abandoned his name of Gabriel, then he is no longer a Belmont in Name. He has taken on his new name. Now, if he goes the mathias way and changes his full name to Vlad Tepes and shit, then we can have our Alucard pretty much like always was. a Tepes. (or in any case, just not a Belmont)
But Adrian Belmont sounds pretty plausable. 
Lol, sounds pretty neat too.