I think Evans has the potential to be a decent player. Like most Rovers players he's been hampered heavily by injuries and played under utter dross managers.
Mowbray would have a good chance of getting him some form back.
I'd be holding onto him.
I sincerely hope that no one takes him on in England ever again but you're probably right that sooner or later a certain agent will have enough sway over some clueless, wealthy owner to make it happen.