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.
This is a common prediction theme for everyone for all the coins that are below a dollar. It is easy to come up with these valuation but everyone need to take into consideration the number of coins in circulation as well and all these coins have a very upper circulation limit and that will not help the case either. So having a logic in prediction is always the smart choice and if the developers can fulfill their promise the price will increase.