Williams has Paddy Lowe, and they have enough funding to develop the car, Haas I see as sometimes being able to challenge for points and sometimes being nowhere as they've traditionally done. Force India will have improved, but I fear that they will fall behind the factory Renault team next year. Add McLaren to the mix, and it seems TR may be fighting for points on occasion, it all depends on what Honda can produce for next year, if Honda does help then I think they can build a good car and develop it throughout the season, they can have a strong points finisher. If Honda makes a beast engine, and TR has the freedom to throw the max into car development they could have a chance at a podium finisher.
As far as the drivers, it takes time to adapt to these cars, Alonso wasn't fast straight away in the Toyota and was not on the pace, so I will reserve judgement on Hartley. I don't know much about Gasley so I can't say one way or the other. They looked evenly matched but the car was probably slower than the Sauber by Abu Dhabi.