I don't think much will change. Perhaps you're right as far as historians 20-30 years hence. Going after those representatives and senators who voted against impeachment and not to convict isn't going to work. Most of those Republican representatives and senators come from pro Trump states and districts. They can say they voted their constituents wishes, the way the folks back home wanted them to vote. Most Democrats represent blue districts and states, anti Trump, so they can say they did the same.
It's already in the works to primary out every representative who voted for impeachment. Probably 8 of the 10 will be. The blow back doesn't come from voting against impeachment, that was expected.
The political arena is for opinions, the legal arena for justice or for determine guilt or innocents. I know what may take place here in Georgia, now if the AG of the U.S. is also looking into it, so much the better. With politicians, self preservation always wins out.
It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.