Depends. If Google et al are right and they have studies which show it degrades performance under certain conditions, then all it would take is one class action to get off the ground.
People will pile on, and the evidence that Verizon knows their technology can cause problems is already mounting. That they're pushing their products through without reviews or certifications could be seen as evidence of negligence or maliciousness.
INAL nor have I really thought into this too hard, but it seems to me the difference between microwaves and wifi in this particular situation is that microwaves were the incumbents and their functionality was not disrupted by wifi, where as now wifi is the incumbent and will allegedly be damaged by the new LTE-U.
People will pile on, and the evidence that Verizon knows their technology can cause problems is already mounting. That they're pushing their products through without reviews or certifications could be seen as evidence of negligence or maliciousness.