OJ is just an individual. An individual, no matter how popular, is just an individual, POTUS is something very different.
The Trump organization has been around for 40 years as you say, and you hope that the NY will indict *now* that Trump is the president, and we are facing the 2020 elections? Not going to happen. They should have indicted him in 2015 or something. If there are crimes going back decades ago, they are incompetent morons if they waited that long to indict. It is over now, he has the get out of jail free card now.
The Dems have to beat him in the elections, the courts are not going to do it.