I can't imagine it will come all that close to TFA. Simply put, the anticipation and marketing of VII was off the charts and that will be hard to replicate -- I also think it's easier to have these massive grosses as a December release with less competition than in May.
Hence why they've now move Ep 8 to Dec.2017
Around 1.5-2 Billion. If it's even more well liked than Episode VII and the brand expands in china, there's also the possibility it will make more than Force Awakens.
Yep. It's a smart move.
I still think that even if it's better than TFA it will have a tough time replicating that box office (domestically, anyway... Internationally it has tons of room to grow.) That was a special one time only event picture in terms of anticipation... They're gonna miss Han Solo in the marketing, IMO. We'll see how much of a draw Rey, Finn, and Poe really are.