There's no way to know the answer. In the past, ticket sellers have been able to sell their inventory of older tickets following a price increase. But with a complete overhaul of the ticketing system, it might not be possible.
UT has been selling physical tickets that have a Feb. 28, 2019 expiration while their e-tickets expire Dec. 31, 2019. I imagine that come tomorrow, there will not be an inventory of e-tickets from prior to the change and only a limited number of physical tickets with Feb. 2019 expiration dates, which they will be able to sell thru the end of this month.