It's a real mess. ReserveAmerica was supposed to continue until the new system came up (I think the new company is NIC USA). But something happened and apparently Active, the company behind ReserveAmerica, told the state they were shutting them down on October 13. But I'm getting this 3rd or 4th- hand so could be all wrong. Coming not long after the July 4th weekend shutdown, this doesn't make the state look too good.
Fortunately, things slow down a lot at the campgrounds after September, so if you want a tent/trailer site you can drive in and you'll have plenty to pick from. Cabins and shelters (at Bass River SF anyway) shut down anyway 11/1 so there isn't much "blackout" period for those. But there are lean-tos available year-round, only 9 of them, and I don't know how reservations will be handled for them.