Some very good points here, but be careful with this line of thinking. Promotability, experience with other parts of the SOC environment, and management experience are all great things and something that could give you a leg up at a major airline.
But going in with the attitude that you’re gonna retire from your regional may be slightly misguided. If you want to get on at a major, the worst thing you can do is get comfortable at a regional. With the turnover at regionals it’s easy to find yourself promoted and making more money, not a bad thing, but it does make it harder when you might be looking at a $10-$15,000 pay cut to start over again at a major at the bottom of the scale. Regional managers aren’t stupid and they know that they’re a stepping stone for 90% of dispatchers on the way to majors. It’s ok to have those aspirations, just don’t throw them in your mangers face every day.