Trump raised $260 Million AFTER he lost the election. He just incited a mob to terrorize Congress and it only garnered 10 Republican votes for impeachment despite the fact that he's headed out the door in a week. Some Republicans even openly admit he was culpable but still won't risk an anti-Trump vote.
He has too much money, too much influence, and too many nutjob supporters willing to ruin their lives for him. The martyr worry is a joke - he's a martyr already regardless of whether the Senate convicts him. He'll be searching for the most powerful position in media possible upon his exit, with a mountain of cash and the ability to raise more at will, and doing so at a time when the Republican party is a minority in the country and just lost control of the Senate, House, and Presidency.
Short of his fat ass having a heart attack or just getting sick of the effort politics requires, he'll primary all the Republicans who crossed him, most will lose, the old Republicans will retire, and the next election will be an absolute shit-show.