Comics DO matter, as they are a cheap medium to churn out lots of ideas. Making a movie costs millions - comics are a tiny fraction of that to create. That said, the medium is going to change drastically and fairly soon, I believe. It only makes sense that comics move to digital distribution as their primary and physical floppies and trades as a secondary production method within the next 10-20 years. I envision a two-screen tablet - akin to a laptop, but with one touchscreen and one view only screen. This way you can still have a 2-page reading experience. Digital comics can be dumbed down for the digital medium, but I think a tablet like that would market well (the 2 screens could be used to view movies in a larger format and all that jazz) and will help comics retain one of the things that make them special (the anticipation of the page-turn).
Anyway, comics are still viable. There are things that can be done easily in comics that simply can't be done in other mediums, or cost too much to do. Yeah, comics matter.