IF- Kevin McCarthy IS so bad of a pick, and I tend to agree... the Dems COULD cross over party lines and support him, WHICH would validate all of those trending against him. Having the Dems support him, would be the kiss of death, but it is doable in the parliamentary sense/process.
One particular Speaker race required 133 ballot votes, and took over 2 months to decide.
Hold The Line!
It’s possible but its a “nuclear” type scenario.
I dont think they will dare do it but I could be wrong.