I wonder if we might see Rick Perry run against him for the senate.
Quite possible, especially if the RNC/Texas GOP feel that Perry can beat Cruz in the primary AND go on to win the general election in 2018 against any RAT candidate.
Also depends if Trump wins in November. If he does, then look for Cruz to face sanctions from McConnell/RNC - including being stripped of seniority and committee assignments, plus told he will NOT receive any funds from the party for his 2018 re-election campaign. McConnell has the power to do this and I'm sure a President-Elect Trump would demand McConnell do this.