So you want to just give up? To give the vandals exactly what they want?
I have to agree with Azani here, I don't think it should just be deleted. Sure, it's rough now, but give these guys a week, if that, and I bet they'll have move on.
I know I haven't been active lately, and I admit, I only came back because I saw the Wiki was being spammed. But while I was fixing the pages, I saw several things that were out of date or needed to be added, and I planned on returning.
And I'd like to add, if you really want to end it, is there some way to just lock it without deleting it? So that the work on it isn't completely lost?