Dispatch should have a lot more movement and be far easier to get hired. There is a huge amount of talent and experience in major airline dispatch groups that gets wasted because airlines on the whole treat their management and non union employees like total dog poo. Just about every major airline wants labor peace so union groups get a far better deal than managers and non union positions. The result is that management and non union jobs attract those that either love managing, love job titles, love that area of work or failed in management at other airlines or in other industries. Sometimes you get good workers in those ranks but a lot of times you dont. Dispatchers moving into those ranks would help airlines be managed better but the overall job package in dispatch with the union contract is much better. So dispatch seniority lists have huge amount of 30 and 40 year employees that stagnate the lists.
If you are a major dispatch hopeful then more upward movement would be the biggest help in getting hired. The only way the vast majority of dispatchers leave is when they retire, die, or both. Very few get fired, quit or move into other jobs in the company.