TBH I'm not sure it ever will. It has tightened, but it's not that close to the national median yet and Republicans seem to be doing a fine job "backfilling" their lost voters through attracting conservatives from other states and the Hispanic working class trend. It's gotten close enough that Dems should eventually win the lower house of the legislature on the geographic bias, and perhaps a couple statewide offices in wave years, but that looks like their ceiling for now.
You mean the Democrats will come back some, but not enough to change the policy of that state.
Well, I think they will get close enough to scare the libertarians (generally the dominant block in the TX R coalition) into telling the hardline social conservatives off before they lose control. For example, I doubt the total abortion ban will stick for long (at the very least, more exceptions will be added). They will also have people like Musk increasingly calling the shots behind the scenes.