I don't watch any reality shows. They've put too many friends out of business. If you want good TV to return, I suggest everyone else stop watching them now.
Well, I've seen a lot of really bad scripted dramas, too, so by that logic, we should stop watching scripted drama, too, if we want "good TV" to return.
I think there are both good and bad of everything, and what people perceive as good and bad is, besides, a personal opinion. Some people, like myself, prefer scripted dramas. Some people prefer scripted comedies. I have a whole bunch of friends who prefer improv over everything else. I know there are people who prefer reality shows. And some people just watch news programs and documentaries. We're all very different people, and that's "okay".
The key is to periodically watch a little of everything, to confirm your predilections, and then favor the programming you like best. Reward that programming with your viewership, leaving the rest. If that means you watch mostly reality shows, that's fine. If it means you watch a good mix of everything, then that's fine too.
As I alluded to above, I'm most a scripted drama person now. I used to watch more comedies (the Thursday night NBC line-up, specifically) and more reality (Survivor, Amazing Race), and I also would watch more news. So even, over time, your own personal tastes can change, and that is also, un-remarkably, fine, too.
I should note, though, that I grant that my change in preference is most likely not really an indicator of any change in the quality of comedies or reality shows or news programs, but is simply an indicator of a change within myself.
Within ourselves we really aren't able to objectively tell the difference between a change in preference that is objectively driven versus subjectively driven. A better indicator of that is aggregate data -- how many people have chosen to watch one type of program versus another. In that context, I think scripted comedies have faltered, while reality shows have maintained pretty steady, sometimes spiking a little high, but coming back to the steady-state level from about five years ago, where they perhaps "belong".