I've drawn comics since I was 4 years old and my comic shop has closed by the same reason mentioned here. I think the best way to make comics more interesting is to publish mini-series only. Continuing series fade to black after they exist for too many years.
Good stories can restore comic popularity.
Only battle scenes, heavy violence, sexy babes and hunks do not make comic book popularity increase. Variation is the key to success. I intend to be a comic book artist, but when I see the comics in the market, I wonder how these companies survive with so little originality.