I think Agravaine wants into Morgana's panties. Or whatever it was they wore then. And if the man who killed his sister and their ill-begotten son die in the process, swell.

Lancelot dead?? No. Just no. He's integral to the whole legend! I'm all for thinking out of the box, but jumping out of the box altogether and then throwing it into a pile of burning horse manure is just suicidal, IMHO.