The danger of keeping him as has been said is the issue of big wages for a player (who will probably not always get a game) when he reaches say, 32.
The Alcantara move could be smoke and mirrors to flush the deal out for a Wijnaldum agreement.
Strangely enough although important to us he hasn't had an assist for us in the last 2 seasons. Replacing him seems like the Moneyball approach.