Trump is not the only individual encompassed in the investigation. If laws were broken, the case can (theoretically) continue until all parties involved would be facing justice.
As President, Trump cannot be tried in civilian courts.
Politics in the US is such that it is doubtful anyone will face jail time. Certainly Trump will not. Few rich white men ever do.
I personally look forward to Trump’s status as a disgraced, McCarthy-esque pariah after he leaves (or is removed from) office, and find amusement at the damage he has done to his precious brand.