Other than General Aviation aircraft appearing in terminal areas, airlines have not worried much about the airspace GA aircraft demand.
Now that VLJs are a growing reality, will airlines change the rules by which we have access to the airways? Will they demand that VLJs pay the same user fees as large airliners, using the argument that the same piece of sky has to be set aside for a VLJ as for a 737? Or will the service providers have a pay scale that only airlines can afford? Will VLJs be required to operate at inefficient altitudes? Will service providers change the "first call, first served" procedures for air traffic control where size will matter?
How will we know if the rules are going to be changed?