Recent statistics indicate that comics are doing well...and those statistics are quite interesting.
Digital sales are up 80%. (No indication of whether this counts people downloading Marvel's free electronic copies).
Print sales are up 18%.
In books, digital product is eating into the sale of physical product. Why is this not happening with comics?
I think there's a simple answer. People hang comics on their walls. Comics are not just about the story, but about the art - and people collect art. Sure, the art is just as good viewed on a tablet or a PC, but it is not as good displayed that way.
I'm going to stick my neck out and say that even if print books fully make the transition to digital media, comics will always be printed...and the statistics indicate not even in smaller numbers.