Weimann is massively overrated, good honest pro, but nowhere near as good or important to us as many on here make out.
He has played mainly in support of Martin this season, and has played almost all minutes in all games, but has only managed to find the net in 2 out of 11 games, albeit both those games were both with important braces. I doubt he will ever contribute more than 12 goals a season.
Last few games he has been poor, and I'd much prefer to see Wells start in his place.