Actually this has potential to go way longer because of the universe Overwatch takes place. There'd possible be elements that makes the sets interesting for non-Overwatch Lego fans as well.
But of course, it has to sell. We will have to wait and see.
There's no guarantee of that at all. We've seen quite a few times how Lego ended up with inaccurate sets because of preliminary information given to them.
Only thing I hope is that you do big heroes justice. Bastion, D.Va and probably Reinhardt will be brickbuilt (I think?) but I'm curious about what you are planning for the rest.
You gotta learn the difference between "im not interested" and "if im not interested, then it should be irrelevant to the entire planet", because it is not.