Okay, but when you're already done that and they cancel it anyway the viewers still want to do something. It worked for other shows, I'm hoping it can work for this one.
Well, let's think about that a bit. It hasn't really "worked" for other shows.
Jericho made a big splash with its campaign, and actually was one of the few that ever got the show to be returned to the schedule. Jericho tanked, though, and the series simply died again, only seven episodes later. That's because there was a
reason why the show was canceled in the first place: It wasn't very popular. Bringing it back for a second-chance doesn't generally make people start watching a show who weren't willing to watch it the first time around. And highly-publicized examples like Jericho only serve to make it far less likely that such efforts will be successful in the future, since the network, there, made the investment, but the viewers didn't do their part of the bargain. Fool them once, shame on you; fool them twice, shame on
them.
Beyond Jericho, other shows I recall where folks launched campaigns to rescue the show after cancellation:
Women's Murder Club - still gone
Moonlight - still gone
Cane - still gone
The 4400 - still gone
Journeyman - still gone
Veronica Mars - still gone
Carnivale - still gone
Enterprise - still gone
Joan of Arcadia - still gone
Eyes - still gone
Knights of Prosperity - still gone
Other shows, like Jericho, did get second chances, but not a single one lasted more than the second-chance, including Farscape and Firefly. However, both of those were Sci-Fi, and that genre is especially positively inclined towards cult favorites.
The last episode that was filmed is supposed to be a huge cliffhanger. At the very least, I think the fans deserve to see it wrapped up. I think they should do that with any show that is canceled.
I think "deserve" is really the crux of the issue here: It implies obligation. There is no such obligation. If it happens;
great! However, in this context, obligation on the part of the network and producers only would stem from a
substantial number of viewers showing the program a significant amount of loyalty, and that simply was not the case.
My interest in making a point of this is really to reduce disappointment -- disappointment I see being fostered by projecting expectations not likely to come to fruition.