I don't really think JO's plan is to lose money for 5 years. I really think that sort of talk is to convince Mesa's insitutional investors that this operation represents a very small portion of Mesa's business, and will at worst lose only a small amount of MAG's overall cash.
Nor do I think he's interested in undercutting Aloha or Hawaiian just for spite . . .and spite it would be, because I think it's highly unlikely that he'll be able to bleed either carrier back into BK with a few beat-up, broken down, APU working "one-day-in-11" CRJs.
If I were a Hawaiian/Aloha pilot, I'd relax and just ignore the whole thing. Remember, JetBlue started with 150 million, a fantastic mangement team, brand new aircraft, and low cost employees. 5 years later, it's an open question as to whether or not they'll be around in another 5. This is MESA . . . we're talking about, not JetBlue.
If you're a tenth as good as you think you are, you'll clean Mesa's clock. If you're in reality just a local monopoly gouging local traffic, well . . . then it might get interesting. Personally, I suspect the truth is somewhere in the middle . . . and you'll pull out ahead in short order (1-2 years, max).