This is absolutely needed.
We have initiated a move to a new backup cluster yesterday and had we known this would happen we would have done it manually in smaller batches to avoid the deluge of support tickets and calls now arriving.
There doesn't seem to me to be any reason to block any features if it is just the backup role that is migrating?
I can totally understand email or application server move getting this message but again could even be handled better there by adding a few to the actual queue at a time or as it does the next one.
So +1
