>Could you get a grant or two? --

Re:open-access? Perhaps. I should note that this area is not my expertise. However, what to do when the grant runs out?

Even so most of our revenue comes from the subscription. A grant may pay for hosting, but what about the time of the developers. Or those working on the publication side. We are already on a near skeleton crew. Especially compared to what we had here in the 1940-80s.