I think some variation on multi-night passes will remain on the table. Prior to this year, I thought it would resemble FFP, just more expensive, and possibly with minor tweeks (say, Fridays and Sundays swapped out as premium night). I'm not as certain of that anymore.
I mean, theoretically, you could buy 25 one-night tickets and it would have the same effect as a FFP. But I wouldn't feel right calling it that. I fear we may be headed for a model where sure, you could get in the same number of nights as before, but the price point is so much higher that as a practical matter, we can say the traditional FFP has been retired.