Will you be able to sell them back for as much or more than you paid? Certainly not in the short term. Maybe someday in the future. If you're looking for "safe" "investment", you'd be better off putting your money under your mattress, IMHO.
Investment? Probably not. Here are the production numbers, not graded: 2020 AM EAGLE SILVER PROOF 1 OZ (W) 357,103 10/4/2020 More than last year, too. If your are set on getting ASEs, buy bullion as close to spot as possible.
From what I've read, they won't have the 2021 silver eagle out there until mid year, so it's very likely there will be a 2021 old design, and a 2021 new design next year, unless they really crank out the 2020s and build a big stockpile to get through a half a year of 2021.
They are probably minting them right now. Well, not today as it is a holiday. They do mint well ahead of the new year. That's why the "First Strike" label is a joke. Make them in September, put in storage, then first in - last out.
Amazing how people buy coins just because of the label on the slab. First strike, early release, autographed by the mint director etc. Crazy.
Interestingly enough, the 2020-S proof is listed as not available. The dealers — TV and otherwise — must have been buying with both hands for grading and flipping.