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Personally, I think most of these ideas are terrible. Expending the level range is going to be dependent on what the new level ranges would be. That one could go either way. 24 hour notice to defenders sounds nice on paper, and I get the idea behind it... but in practice, it's just going to make GvG even more of a slog than it already is.
Furthermore, if you reduce the AFK timer from 7 days down to 48 hours, that's the worst idea on this entire list. It's just going to mean that almost nobody has any viable targets, unless the expanded level ranges are intended to try and compensate for this. There are a LOT of semi-active players who still log in once or twice a week, but would no longer be viable GvG targets.
I would much rather you guys be looking at ways to try and make GvG more rewarding or engaging, instead of gutting it and making it even more frustrating. It's barely worth it as it is, and a lot of these suggested "improvements" are going to make it so nobody will even bother.