I've been following what has been said about this topic, and at this point I think it's a big unknown. On the one hand, money always talks, but on the other, Solomun seems loyal to his audience and his home on the island. Honestly, I don't think the atmosphere at any other club will ever be the same. The main reason I go to the island every year is his session at Pacha, for everything it represents. I'll be really disappointed if that happens... I hope it's just speculation. If it were your last year, everyone would already be talking about it. Although every year there is talk of UNVRS...
But, As you mentioned, he redefined the whole club because of his residency, and although his connection with the club has seen better days, he feels a unique connection there.
I don't believe 1% that it was his last dance at Pacha, otherwise it would have been announced and he would have played until at least noon, followed by an after-party, of course