I think we'll see temp scans become a regular thing till the vaccine is widely available. Then it'll become part of the standard pandemic response.
Anyway, Touring Plans did a post two days ago about the impact of crowds depending on reopening the parks. TL;DR is there will be a few weeks of low crowds followed by spikes around the holidays as people rebook. Oddly enough early 2021 looks the most crowded in terms of rebookings.
There was an error in the update that was published March 23, at 1 pm. A second update was published at 9:40 pm to corre
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