I came to post one update, but it seems worth adding a few more, since this thread has been inactive for a while.
April 14, 2020 - Paine Field received a disproportionately small amount of aid directed to airports by the CARES act, because it was calculated based on 2018 passenger volumes, when the terminal was not yet open.Everett Herald Article
May 22, 2020 - Paine Field passenger operations shutdown for 10 weeks of work to replace asphalt on the ramp with concrete. This was previously planned to be done in phases over a longer period of time, but with Alaska only operating 1 flight per day, the FAA gave approval to suspend all service for this work.Everett Herald ArticleDedicated Airliners.net discussion topic
August 1, 2020 - Ramp work is complete and flights resume. Alaska Airlines starts with 1 flight per day each to Las Vegas and Phoenix. United starts with 1 flight per day to Denver. The terminal restaurant is re-opened, too. It also has been noted that the Moving Forward Act, a further bill to aid airports, will allocate airport financial assistance based on 2019 passenger volumes.Everett Herald Article Before OpeningEverett Herald Article After Opening
August 26, 2020 - Alaska Airlines announces a gradual increase to a hoped for level of 6 flights per day during the winter. Load factor is reported at 48%. No information so far about United.Everett Herald Article
Overall, the terminal owner sounds upbeat. There doesn't seem to be concern about the small airport's ability to weather the pandemic financially.