I'll be buying scores, if not hundreds of 5e books!
But then, that's because I own a game store.
Why would I take them home, then? Because I like to move forward, and I find that (most of the time) I like the new.
Strangely, I never go back. For instance, I never played 2nd Ed ever again when 3.0 came out in spite of not being a big fan, and I've not played 3.5 again since 4e came out. I'm somewhat interested in trying Pathfinder (it sells well, people seem to like it) but I'm a DM with very little time to prep and I don't suppose it's much lighter on prep time than 3.5 which took more work than I've got time for. (What with wife, kids, business to run).