Because it overlaps with cable deployment plans.
The landline monopolies only care about this because they paid the FCC for short-haul wireless privileges and don't want competing LTE solutions to get a free ride or be competitively inexpensive.
The American Baby Bells (and their cousin Bell Canada) intend to replace rotting copper infrastructure with short-haul wireless. AT&T is already advertising the next phase of their U-Verse Wireless program in test markets.
FCC recently decided that 911 requirements on POTS will be derated to let this happen, which was a major regulatory milestone. Legacy customers may be forced off their landline the next time it breaks if LTE short-haul is available.