After about 20 or so years now, one of the main things I've learned is that you aren't as indispensable as you think you are. You might think the company will g

After about 20 or so years now, one of the main things I've learned is that you aren't as indispensable as you think you are. You might think the company will go under or otherwise degrade when you leave, but that never happens. The company will trudge along without you. That being said though, if you do believe yourself to be "indispensable" to a degree in which the burden of you leaving is large, then by all means, use that to your advantage in obtaining raises/promotions/etc.