This has been discussed numerous times over the years, and a large expansion of the FM band simply isn't going to happen.
The one thing that actually is feasible is to open up the use of 87.7 and 87.9 MHz to more than just analog Channel 6 TV stations pretending to be FM radio stations.
They should probably allow translators to use 87.5/7/9 but maybe not full powered stations. Since digital TV stations use less of the airways I wonder if a digital station on channel 6 would occupy enough space to cover 87 MHz? Or if a low powered analog broadcast would interfere the digital TV operations but not be affected by anything on 88 MHz? Apparently there is at least one translator in Nevada licensed to 87.9 so maybe it will be considered.