I think GOP is still going to win in Collin in 2024 no matter who the candidate is, but I think a MAGA candidate could make it very close, Trump only won by 4 pts here, but a generic republican like Cornyn won by 10 points in the same election. So, it all depends.
Trump = 1-2 points
DeSantis or someone more friendly = 5-7 points
Why would a trump type Republican not do well there? It’s not a very liberal type suburb
Trump performed worse there than any Republican candidate has in many, many years. It's not likely that Republicans add enough votes there to hold onto it in 2024 with a Trump clone. The way the GOP butchered it in redistricting says a lot.