The NCAA Championships bid package (all sports) for 2019-2022 states;
"NCAA CHAMPIONSHIP POLICY RELATED TO SPORTS WAGERING: No predetermined session of an NCAA championship may be conducted in a state with legal wagering that is based on single-game betting or the outcome of any event (i.e., high school, college or professional) in a sport in which the NCAA conducts a championship. This policy currently excludes the state of Nevada."
As far as Nevada...yes, the only arena that would be considered next cycle (2023-2026) is the T-Mobile Arena in Paradise, NV. The Thomas & Mack Center appears to be slightly too small. As NoVa says, we'll have to wait to see how the football arena thing works out. Regardless, we're several years away from any action in Nevada.
As far as history, only 3 times since 1928, has the Championships been held west of Nevada, all on college campuses. Twice at Oregon State (1961 and 1980), and once at the University of Washington (1973). I may be mistaken, we'll see, but Nevada may be a hard sell for Wrestling Championships given it's proximity to fan bases.