Gaskell has never had a bad game for Wasps, and it would be disappointing to see him go after many years as a Wasp.
However, he's going to be on a high salary, he does spend a fair amount of time injured, we have to look after Cardall and give him the opportunities he deserves if we want to keep hold of him (plus Vuka and the incoming Scottish lock), and the reduced cap means cuts are inevitable even if some are hard to swallow. Wasps are potentially offering reduced money for him to stay, and if he has a more lucrative offer on the table from Japan with perhaps only a few years left playing top level rugby, then who could blame him.
Would be disappointing if true of course as it always is to see a long Wasps career come to an end, but may actually benefit all.