The fox show is well remembered (and well-thought of) among people who were young teenagers during that time. Anyone who moved over to the scifi channel days were more hard-core and may have some mixed feelings about it (though everyone seems to be fond of what sliders could be). So the property has good general awareness, some immediate built in audience (hardcore nerds) and if decent and validated by the nerd audience, could grow where the casual audience starts trying it thereafter.
The biggest challenge to getting this back on tv is tv execs looking at it as a cheesey/corney 90s show. Because let's face it, as things progressed, it became that at times. It's hard to pitch that to other executives without looking silly.
Plus, tv tastes are just less innocent now. An extreme example, but could Different Strokes or Family Ties work now? No. Audiences have seen so much more programming by now, 20 years later, they have sharper pallettes. They demand smarter, and every tv exec is pandering toward the smart, snarky twitter crowd that drive the influential conversation (particuarly what's portrayed around the media and the bloggers at these entities). So you need to do a show that they can embrace.
Either Sliders partially polks fun at itself as a summer movie, syfy style, or they aim to be a reboot or revival on a younger channel (a family or preteen one) and do the old fox style stuff or they get smarter and sleeker if they want to try to attract an adult crowd (which is required if you're going to be on a major cable network).
Torme mentioned sliders being "of its time". I think that's pretty much the dilemma - you have to either go younger or update the show - if you are going to bring it back as a series. There's no excuse though why SyFy execs couldn't greenlight a summer movie and I'd love for someone to do a miniseries. I think it's going to take someone other than torme to bring it back though.
I think the best thing we can do is send around Jerry's interview on Slidecage indicating he would like the show to be brought back so maybe some of the scifi blogs do a post about his interest in a revival and maybe it catches interest on the internet and gets picked up more. That sort of buzz is what tv execs look for in making decisions on programming. The X-Files Files and the buzz that built really was the tipping point for bringing x files back.