The speaker of the House is right behind the vice president in the presidential line of succession. A speaker might have to preside over a disputed presidential election. A speaker in theory could even manufacture disputes by leading his or her party to reject state electors, an amped-up version of what we saw congressional Republicans do on January 6, 2021.
The next speaker should not be someone we already know is willing to manufacture disputes and support groundless claims to overturn an election to install the president he wants.