At this point you are clearly too important to sack, so no worries there.
I don't know about that. Maybe I'm just being paranoid, or insecure, or something like that... But I suspect I could be replaced fairly easy.
There aren't a whole lot of IT jobs up here... And we've got a decent college absolutely full of fresh IT graduates...
Granted, they wouldn't know the place like I do. They wouldn't have the experience. They'd need a lot of training. The place would go to hell in the mean-time.
But when has that stopped a place from canning a good employee for somebody cheaper?
Of course, you are in the best position to judge your circumstances. Just wanted to put some food for thought out there. You might also want to keep in mind that there are real costs to the employer for firing/hiring, and they would have to balance that (and the whole going-to-hell thing) against the possible benefits to them.
Besides that, occasionally you will find that that there are decent human beings that just don't "get it" overseeing these things. If you are subtle and avoid the "screw you guys, I'm slacking" confrontations, someone might realize there are real issues to deal with and do the decent thing, especially if there are people around who recognize your value. Again, depends a lot on circumstances.
Good luck...