Does it need to get as low as 100 or 50 patrons before he throws in the towel? He has already dropped from about 900 to 450, and keeps on falling.
A key benchmark will be the issue of Tibor and his continued employment. The 540 Patron goal explicitly stated that he would "explore the possibility of hiring someone to assist with video editing", an obvious reference to Tibor. He's in danger of falling 100 patrons below that goal.
I'd imagine that Lloyd would keep Tibor as long as he can possibly do so due to the bad optics of having to let him go due to decreasing Patrons and the fact he doesn't want to go back to editing them himself. That rant didn't come randomly and he mentioned Tibor's employment for a reason. He can afford him now but I think this is on the assumption his Patrons will start increasing again and soon.
But if/when Tibor gets the axe you will know the sky is falling.