Most people don't think of waiting tables as a permanent gig. Usually it's more of a "I'll wait tables until I get through school" or "I can cocktail until I get a real job" (BTW the real job thing...I'm not sure it exists.) Some people fall in love with waiting and the flexibility it can bring, or the night life that starts right after work, or just meeting lots of people and helping them out.
Most of us burn out.
One of the best ways to keep from burning out is to focus on getting better. Once you stop improving you start a downhill spiral that will leave you disenchanted and unhappy. Don't forget to get better at the things that will help later as well.
It's in our best interest to keep in mind while waiting tables the skill sets and the connections that can be made. There are tons skills that you can learn as a server that you will have a hard time learning anywhere else. Where else would you be expected to deal with maybe 100 people a night, figure out what they want and help them have a good time? The school of serving gives you people skills that other schools cannot even start to teach. You learn to look at a couple and tell if they have been fighting or dancing or both.
You learn how to start the delicate dance of service just the right way. If you don't all of your nights are hard and you don't make much money. You get a chance to relearn these lessons many times every night. If you don't do it right you are given immediate feedback and when you do it well you are rewarded.
After you learn the beginnings of the dance you move on to the nuances. The "That burrito is soo much better with the green sauce." The "Why don't you try the Madras with the Grey Goose." The "The brownie is OK but the Oreo cheesecake is really good today." You have the check ready when they want it, the drinks stay full and you achieve a state of flow.
Years later these skills will pay off as you read your management, board members, and clients. You will be able to better sell pharmaceuticals, cars, apartment buildings, or companies.