[ALittleLight]

Failure may not be so bad. A company that doesn't want to invest in IT when everything is working likely will invest when things break. I would say just make sure your bosses know what's coming and put it in writing. Write a succinct report, with the headline up front, that explains exactly what will happen without additional resources and what you could make happen with which additional resources. Get them to sign off on it. When failures start to happen, point to your report and explain that you're locked and loaded with your plan to fix it as soon as you have the resources.

I would be very cautious about negotiating a salary when you're in the position of knowing you can't get a better salary on the market. Fix what's wrong with your resume, get a better offer, and then negotiate (or not). Just not a good negotiating spot to be in if you know you ultimately have to accept what they say.