My understanding is the volunteers want to be part of the system properly.
The problem is, if your wish is to be "part of the system properly," you need to have the ability to keep the units staffed all of the time, not just when members can find the time to pitch in. Inconsistent staffing, and lack of consistent drills and in-service training for all members are two common complanits against volunteers.
A good example of the volunteer staffing issue would be the Sterling Volunteer Rescue Squad. They are part of the Loudon County 911 system. They have two all-volunteer stations, and one combo station with the county. At full strength they would have two ALS units, and 3-4 Trauma (EMT-E) or BLS units. They have two ALS some of the time, maybe half the time, and otherwise just one ALS, sometimes none, just some guy in a chase car. The county wants to put paid ALS in their stations, but they refuse to let them in. Meanwhile, they use copious amounts of automatic aid from Fairfax, MWAA (Dulles Airport), and Prince William County. We had had up to 4 automatic aid units running into Sterling, and the career Loudon units are also tired of running into Sterling regularly.
That is the problem with having volunteers being relied upon as the primary 911 staffing/deployment for a district. If you include the vollies a part of the normal 911 system, and give them a dedicated CSL (Cross Street Location, a post), they can't just decide to staff that post when they feel like it. It needs to be staffed 24/7 or 16 hrs/day if there is no tour1 (overnight) requirement. If you think that it's acceptable to have the vollies staff a CSL inconsistently, then FDNY would have to alter all surrounding units' CSL to reflect the vollie's posting. It simply doesn't make sense.
If you want to play 911, your organization needs to be able to do it 24/7/365, not just when it's convenient for the members to drop in for a few hours. Perhaps the inability to fill this requirement is a good reason why the vollies don't have a dedicated CSL incorporated into FDNY's deployment matrix.