It keeps getting worse for Trump. It's already clear that there's sufficient evidence to charge him with obstruction of an official proceeding of Congress and conspiracy to defraud the United States. Seditious conspiracy and wire fraud (for the bogus "Election Defense Fund") may also be in play. It's hard to imagine that the tapes you've referenced won't produce additional evidence of criminality. And today's testimony from Raffensperger will be devastating for Trump. Instructing Raffensperger to "find 11,780 votes, which is one more than we have," and then implying Raffensperger could be prosecuted if he didn't do Trump's bidding, is a/the smoking gun.
Of course the ability to indict him and actually doing so are two different things. Criminally prosecuting a former president is unprecedented and poses a risk. The greater risk, though, would be not prosecuting him despite clear and compelling evidence of an egregious abuse of power and criminal wrongdoing. That would send the message that, yes, one man is in fact above the law, it would invite similar misconduct in the future and unquestionably open the door to autocratic rule.