Losing TX for the GOP would result in them basically having an 8-12 year period similar to the Democrats in the 1980s and would be a disaster for conservatives just like the 1980s were for liberals .
This basically sums up my thoughts on a (Atlas red) Texas. Aside from solidifying a major change in American politics, it would coincide with Democratic dominance of the executive branch. The Republican Party would be forced to reassess some of its policy decisions, especially those concerning the minority voters who (by the time Texas goes Atlas Red) would overwhelmingy compromise the Texas electorate.