I think the best bet is that that at some point going from 30B params to 9T params is realistically going to give the closed model a 10% edge in niche tasks, but that the open model would be very useful most of the time still.

I don't know how realistic that expectation is, but if you think about the difference between say 10,000 USD speakers and 50,000 speakers then the 50k ones may sound slightly better but certainly not enough to justify the 40k difference