I'm not talking about scenario (because i know that 50% of this forum don't want a sequel because they think that a sequel will be bad like they thought that a sequel to batman begins will be bad...)

but about cast.

We know that everyone in the cast sign for a sequel.
We know that Nolan like to use same actors.
We know that Nolan wants to use the Inception universe with an MMORPG. But he like the idea to make a sequel to Inception know that the universe is very popular.

So an Inception sequel is possible right?