It may be a case of how do Wasps/Daly actually do this? The changes after the Bath/Tigers swap (was it them?) mean you simply can't go. The contract has to be broken. Daly may or may not have a clause giving him the opportunity to break, but he might have to take that to court or arbitration. Not good for either side and certainly not quick. Even if he could simply say, 'I am using clause x to leave.' The second he does that, he goes, and he would lose his pay etc for the rest of this year, and, out of contract, maybe his England place. So, if that is the case, he has to do it the day after his last pay cheque for this season. Is that in May or in late summer?
Or, Sarries need to find a hole in their salary cap to make way for him now (unlikely), and then Daly and Wasps simply part company by mutual agreement (which is allowed by the rules). The trouble is, Daly won't want to get injured in any Wasps games, so one might think that he is less committed in contact situations. That appears to be what we are seeing in his recent appearances. He looked to actually step away from catching a high ball on Sunday, and also threw the ball away instead of taking his time and passing accurately. His tackling was far from stellar.