If NBCUniversal has no interest in reviving Sliders, but other people in power are interested, I feel like they might sell of the rights. If the show were to come back, I probably see it being on Netflix or Disney+.
O'Connell might be okay with doing the show on a crowdfunded salary, but Davies would most definitly want a much bigger settlement. Derricks and Lloyd would probably be difficult to get if the show were to come back, but that is another story altogether.
But all in all, I don't think crowdfunding is the way to go to bring the show back. Sliders has a small fanbase, and of that small fanbase, there is an even smaller number of people who would give their money to Kickstarter for the possibility of the show coming back.
If Sliders is revived as an audio drama, there's almost no money needed. Just enough for the actors and audio equipment and can be hosted on any podcast website. But I don't think Sliders would be revived that way. Sliders is a pretty visual show. I'm just not sure how well it would translate to audio format. Plus, it's a very small medium that I don't think the actors would be interested in doing.