I'm not going to pretend to know what technologies will be on the horizon in four years, but if the merger isn't approved I would imagine T-Mobile would renew the roaming agreement with Sprint. If I were T-Mobile I'd hate to have Sprint sending millions of dollars to Verizon or AT&T when I could be using Sprint's money to develop a 5g network to compete against AT&T/Verizon while also holding Sprint hostage.