I think you also need to define exactly which '8th edition' you're talking about. For example, I would be totally down for a game of early 8th edition, with either pre-8th edition army books or just the first few 8th edition books, but because I love the 6th edition Wood Elf army book and hate the 8th edition one I wouldn't want a game of late 8th edition when the 8th edition Wood Elf book was a thing. ET supplements would also be right out for me (except maybe porting over the 50% on Lords thing because I like to lavish magic items on my characters).

Aside from that though I'd mostly stick to late 6th edition and early 7th edition (the important thing for me is using the 6th edition Wood Elf book you see), or some hybrid of 6th and 8th since I like elements of both.