Texas has only one decent Senator- TX and the US would lose him as a Senator if he moved to the Court, but there would be advantages as well. Now if he were replacing Roberts, we all could have a celebration.
Associate Justices have been elevated to Chief Justice:
Three incumbent associate justices have been nominated by the president and confirmed by the Senate as chief justice: Edward Douglass White in 1910, Harlan Fiske Stone in 1941, and William Rehnquist in 1986. A fourth, Abe Fortas, was nominated to the position in 1968 but was not confirmed.