Polls can be biased because they tend to under-represent folks not fond of readin' and ritin'. Those who respond tend to be older and educated. There may be a correlation with Qanon whose members distrust msm.
I don't think he will leave the spotlight. He likes his rallies too much. He can agitate more as an outsider and foment a stronger fascist movement. I expect him to clean out the White House if he leaves. Quite a hero.