[user104658]

The big names like Kit and Emilia will be booked solid for a couple of years and then vanish. Probably the same for Maisie Williams and Sophie Turner.

Peter Dinklage was around long before GoT and will continue to be after. Lena will continue taking character roles and be successful in that sense.

I actually think Nikolai.. Something... Jaime Lannister is likely to shown up in a tonne of action-type films probably in high profile supporting roles, or villain roles.

Brienne I agree with the above; lots of supporting roles will come her way.

Alfie Allen will likely have a successful career but I can see it being more in British Telly dramas than in Hollywood.

Bran will never act again and we'll see him on one of these "stars who now have normal jobs" lists in 10 years as like an architect or summat.