An unfortunately common argument used against community fiber networks is that everything will be wireless in the future. This was used frequently last year in North Carolina by defenders of the pro-TWC legislation to create new barriers against community fiber networks.
The technical among us may want to get into the math theory with the Shannon-Hartley theorem to explain why wired is more reliable than wireless and therefore capable of much higher capacity.
Others might point that wireless will have less capacity because a wireless connection is really a wired connection to a tower somewhere that is then shared among hundreds or thousands of other users. Empirically, there is no wireless connection that beats fiber-optics.