I have heard from someone involved with Philcon that they are parallel-planning for an in-person and a virtual con, so they are prepared to run with all-virtual if needed.

I suspect Philcon will eventually join the ranks of the virtual cons. As with a lot of other conventions, they are likely waiting until it becomes clear they can't hold the con due to NJ restrictions on size of indoor gatherings. At that point either the hotel breaks the contract at no cost to PSFS, or PSFS can negotiate down any potential penalties for canceling themselves based on not being able to viably hold the con. (Or the hotel simply closes permanently due to lack of business.)

The Chessiecon hotel also appears to have closed permanently.