I think you underestimate by a wide margin President Trump’s fierce resolve about those specific traitors & evildoers when you speculate that he will not arrest O’Bummer et al. Time will tell.
Many people are naive and don't understand what will happen if Obama is arrested. There would be massive civil disobedience, riots, looting, etc.
To arrest a former president, there would need to be a lot of preparation for the public to accept it. There would be a need for news stories of corruption that has gone on for months dominating the news so the public understands what is happening. In other words, it should not be a surprise.
Plus, other reasons I won't bore you with. I have never been more certain of anything. We as a nation are not prepared to see a former president go to jail.
It will be sufficient to take down the next level at the DOJ and the FBI. Through those stories, the public will come to understand Obama's corruption and that will have to suffice.