Heey! No fair!
Fine, gimme some names, I'll toss 'em in.

And technically, I'm quite sure sci-fi fans are demographically MUCH more tech- (and internet-) savvy than the average Billy-Bob, and seeing from all the *****ing I've seen online if you organized this well you could make the Sci-fi channel easily lose about 5% of its viewers.
In case you weren't aware, 5% for a big company is a
lot. That, and the possibility that the trend wouldn't stop there, would mean that SFC execs would be faced between the choices of replacing the show and bankruptcy. Extortion, yes, but only in that you're refusing to be sold by them any more.
The trick is, of course, getting all those people willing to go that far. Not impossible, by any means, but you need a cause more sweeping and... well, interesting than Farscape to get a boycott. Maybe a whole BUNCH of good shows they canceled for the current crap.