I think we all should be grateful that Andy is getting proper treatment for his back. This best thing to do in the long term.
I'm sure we all agree with that. If the worst came to the worst and Andy was forced to miss Wimbles I'd be more disappointed for him than anything, because I truly believe he has such a chance this year. However, it's what is best down the line that matters. If missing RG now, and maybe Wimbles too, gives Andy time to get better and gives him a longer career at the end of the day, so be it.
That said, I have my fingers crossed for Andy and his chance of playing SW19. The general consensus appears to be that withdrawing from RG was right and should give him time to be ready for SW19.
As for what Andy is doing, I suppose he can't jump in to practice right on the back of pulling out of RG. It would look odd. I bet he can't wait to get back to it though. I bet that while we are watching some of RG Andy will be working on some things.
In a way I'm glad Queen's is before Wimbles. If Andy was to go in to Queen's a bit rusty it wouldn't worry me too much. Winning would be nice, but he doesn't need Queen's to prove himself. All I think Queen's would help with is getting him match sharp for Wimbledon.