I think it depends on the business.
Obviously I`m just a hairline away from being a 1-woman show so if I quit, we tank! That`s how we run - I can`t hire a sales person, marketing person, accountant, bookkeeper, hr manager, nanny and maid because I`d have to pass those costs to the customer, therefore making me too expensive. Our business runs best on the lean side, because I have less people to worry about ...
But if you are running a business with many employees and you are just there to build and leave ... you want it to run fine without you.
BTW, here`s the "Common Mistakes"
I found it a little sad for them to downplay the micro-businesses in the article, saying
"Nothing wrong with that – except when you’re worked to the bone. You
can’t step back. You can’t slow down. Your company won’t run without
you. When that happens, you’ve built nothing."
I feel like we have built A LOT in the past few months, and I still have no plans for this company ever running without me. If you stick to the life plan concept, my life plan was to never have an office so why would I want to grow so big as to need one? If your plan was to remain a sole proprietorship, and you`re just fine with that ... who is someone to tell you that you have worked so hard yet built nothing?