In my opinion, 1 dollar per coin seems a bit impossible to me because if Tron by any chance reaches $1 then that will mean a $100 billion market cap for the project which seems way too high for me.
The creators of TRON do not have an aim to let this altcoins gain fantastically (for instance), to reach a dollar per a coin or more. Now, they have concentrated on the “secret” stable coin, which will also help TRON to climb back to the top 10th cryptocurrencies, and maybe, to the top 5, later.