That is not wishful thinking. That IS the law. It really isn't like Trump doesnt give enough openings for a credible case, anyway.I mean, if you take a wishful thinking approach to law while simultaneously ignoring the past 9 years then sure, this is pretty sound reasoning. Republicans are what they are, democrats are craven, unprincipled hacks. Even if this miraculous impeachment process got carried through to the end it would take months anyways, more than enough for the damage to be already be long materialized. And even then, after threading the political needle god knows how many consecutive times the only thing the world would end up with is JD fucking vance. Along with the downside of turning trump into a martyr for lunatics (not that he isn't already but this would only make it worse).
My point also wasn't that the real impeachment is going to get through, Republicans might block it again. But if they do in an environment in which Trump and his actions are increasingly unpopular and is seen as a madman by very many Americans, that helps to rally everyone against Republicans (especially if the Impeachment fails in the House or Senate due to Republicans).
Republicans do not want to be forced to defend Trump's economic actions, as it goes against all of their evergreens of fiscal prudence and open markets. It will be very helpful for democrats if republicans have to spend months defending unpopular Tariffs while democrats can shout about rising prices.