He probably should be. It would basically hand him the election in 2020 if the democrats tried and failed though, do any of us want that...?
Depends on how you look at it. He is deserving of being impeached, yes. Impeaching him might cost house seats for the Democrats and it might even be a significant number, therefor, the question of should he be impeached becomes much more complicated. I'd be satisfied with letting him lose his re-election bid and indict him once he's no longer a sitting President.
https://www.yahoo.com/news/house-panel-chairman-says-mueller-134110110.html House assessing Trump impeachment