There's definitely some of that, and the current runs of Batman and Detective are certainly prime offenders of this with both of them being on like part ten of their stories with no end in sight yet but there are plenty of other modern books that are still fantastic. I don't think Waid's World's Finest for instance has had a story go on for longer than three parts yet and it's super fun each issue, like wise although there is an over arching villain lurking in the back ground Taylor's Nightwing has been mostly two or three part stories and Action and Superman are both the same way. 

All in all I still insist that Sturgeon's( or Rudyard Kipling's) adage about nearly everything being crap still applies when it comes to comics; yes there are a lot of bad comics...but there always were a lot of bad books and I don't think that ratio is worse now, in fact the opposite is probably closer to reality because as the market has shrunk you really need to stand out in order to succeed which wasn't always true in the past. 

By and large and I don't think most people do bother much with the bad books. Sure, there are definitely some people who will buy Batman, Detective or X-Men no matter what due to wanting to keep a run intact or simply due to brand loyalty but the majority move on if they sour on a book and sales decline and the creative team is forced to change and that happens pretty frequently. Which is why I said I felt that although Sturgeon's(or Kipling's) ratio apples to comics of today and yesterday that it might actually be slightly off for books of today. Because the market is smaller than it once was there are less people who are satisfied with mediocre or bad books which wasn't the case in the past, which means that to be really successful and have long runs you really need to keep a certain level of quality. It's still mostly crap, like anything else, but due to increased market factors I think if you did a deep dive into the over all market you'd see that there is more incentive to put outand focus more on higher quality content. It's probably not much more than it ever was in the past but its definitely my feeling that I'm slightly more likely to chance upon a really good book now than if I trawled say all the books published in 1987.

Digital is definitely a good option, I also still buy physical copies too but I just don't pull anything unless I really know I'm going to like it and just pick up everything else off the shelf that way I'm not obligated to buy anything I don't want.