I just took a look at my district (Seattle) in PNW to see how the team counts and rostered players look for 2020.
See my blog for details, but the summary is that our team count has been growing but at a declining rate since 2016 (11%, 7%, 4%), but has jumped back up to 8% for 2020. But as of right now, a day before play begins, the rostered player count has dropped 11% while it had been going up similar to the team count in prior years (9%, 8%, 5%).
My hypothesis is that as a result of the 4-court format, there may be a few more teams than there would have been with a 5-court format, but that roster sizes will be smaller and the total and unique rostered players may be less than there would have been with a 5-court format.
With the data thus far, the first part seems supported, team count went up more than the trend and rostered players are a lot less than before, but there may also be a fair number of players procrastinating and just haven't signed up yet. So this probably deserves another look in 4-6 weeks.
What other areas are starting 40+ right away and this analysis could be done for?