make the switch man!
With your experience, I assume you cover the ATP reqs, you will have no issue getting hired. Next you get into is what regional would work best for you, etc. I personally think one of the 3 WOs of American is one of the safest bets right now because of their flow into AA. I'm not like others that are just happy to sit back and flow whenever, I'll be actively trying to get hired at a legacy as soon as I resume looks good enough, so I treat the flow as a major insurance policy sitting in my back pocket.
No one knows exactly where the industry, hiring progression, etc will be in 3 years. It might take you 5 years to get to a legacy, maybe 7, and hell maybe only 3. No one knows, and those who proclaim to are blowing their louder smoke just trying to enforce that they will be right. What we do know is the forecast for the next 8-10 years is touching an unprecedented level.
IF you want to talk more about the regionals, what made me make my decision, etc. PM me. I'll be happy to chat.