That's the worst idea for many reasons, couple examples:
 - password prompts after evolution's run for disabled (in selector) sources
 - too much unnecessary network I/O (most remote backends runs sync on open)
 - doesn't do what user told it to do (Unselected means unselected. Dot.)
 - unable to debug anything in factories when it misbehaves this way

Next time ask peers, users and usability experts for their opinion, before doing such decision.