Sadly they are already falling in sales. In fact I heard it said that the only thing keeping comics alive was the money they have made in the movie industry lately. Web comics are now available. They are easier to acquire, cheaper and Green friendly, this also does not bode well for the comics we all grew up with.
On top of all that we have an economy that's killing the middle class, which includes poor people as well, now that the government has decided to pretend there are very few poor people in this country. So who can afford to buy comics that would actually be interested in them? Not enough people to keep them in business on their own.