How long do we think it will take Trump to reference his buddy Duterte's threat to imprison anyone who tries to impeach him? He's already threatened to imprison reporters who ask him questions he doesn't like.
I don't think Trump wants to be that direct. He knows it is not in his best interest.
I don't think his habit of making vague, backhanded threats and/or "encouraging" his supporters to do stuff is building to something, I think it's exactly where he wants to be. It's deniable. He knows as long as he is within even the same zipcode as "the line" the discourse will be bogged down in defining exactly where the line is and whether or not he crossed it and go nowhere beyond that.
And really don't think Trump is ever going to drop the act and just start being as blatant as it's easy to think he wants to be. Trump's stupid, but he's a very specific kind of stupid.
Difference I don't that's a good thing because he's more dangerous doing this because he's harder to deal with.