So I think Alucard would be on pretty equal footing with the rest after those events. Heck, you could maybe even make a game around that. Alucard being weak, having to regain new familiars, and a new threat against London happens or something. Easy way to put in a level up/upgrade system of some kind. And you could then maybe unlock other characters like Ceras and Anderson to play with. Something like...Play Alucard, returning to demi-godhood as he goes through the game. Then at certain points you can unlock other characters. And then you can play with those characters through the same overarching story, but with different things happening to them.
Anyway, yea...big fan of the manga/OVA. I would love a spectacle fighter or even an action adventure with horror mixed in based on those two. But I doubt it will ever happen. =/