I remember discussing the strains getting axed at Wyeast but I didn't think 3726 was on that list. Too many breweries are switching over to it as their go-to saison strain (well at least some lab providing the Blaugies yeast). Maybe they said they wouldn't have more homebrew production because commercial pitches had consumed all of their stock at the time.
To OP's point I don't have anything to add from Wyeast's availability but people who like the Unibroue strain tend to love it deeply and you could probably find somebody who has some slurry they could share. If not here, maybe on one of the facebook homebrewing groups or HBT.