I have a very hard time believing that Little Neck/Douglaston residents care nearly as much about that connection as you do. If they cared that much about getting the LIRR, they would probably gun for the Port Washington Branch or Queens Village over Jamaica. The far longer bus trip offers no real benefit aside from having more options in Jamaica to/from Manhattan/Brooklyn, which quickly becomes a wash because that's all it has going for it. Maybe you could argue that the subway connection is worse, but even that has ways around it (ending in Kew Gardens or Forest Hills, the latter having more Manhattan-bound subway options and a Zone 1 LIRR station a short distance from Queens Boulevard).
Most people using the existing Q30 to Jamaica are either seeking Manhattan or Jamaica itself. There's no reason to expect this to fundamentally change. There are valid criticisms of the plan, but this ain't it, chief.