Indispensable employee uses a company blunder to negotiate a 30% raise after they fire an entire support department: 'I'm using this to twist their arm'

When this employee's company fired an entire department, suddenly, his role became indispensable. What's a struggling ladder-climber to do if not use a business's folly to their own gain? 

I've been told that it's in every employee's best interest to diversify their skillset in their career, making themselves into a well-known figure at the company, while remaining balanced. To keep from painting yourself into a corner and becoming TOO valuable in a position (and therefore unpromotable), your diverse skills can be cross-pollinated across all departments, both laterally and upwards. In the corporate world, this kind of jargon is just everyday talk, but when the worker in this next story heard this piece of advice, he took it to heart. After fine-tuning his role with his company, he found that there were only a handful of other employees who could cover his position when he was taking PTO—and they were all from the customer support department. 

However, when the CEO found out that customers were most unhappy with their support department, as customers typically are, he decided to boost their company's rating numbers by laying off the entire support squad. Now, with nobody to back him up, this employee decided that his solo status meant he could capitalize financially, using this company blunder to negotiate a 30%+ raise.