People are free to make their own decisions when it comes to their career so let them! Personally, if I were just starting out and was told I could be at the largest airline in the world in 5-6 years I would say sign me up! But that's just me. And before the "envoy salesman" remarks start I'll say straight up this place sucks in a lot of aspects. First year pay sucks, having our contract violated sucks. Lots of things suck. But at the end of the day I can look at those AA pay rates and have something big to look forward to.
Listening to people tell you the flow won't work (and they say it with such certainty) is absurd. The reality is is that it should work. Will it as advertised? Nobody knows for sure 100%. I hope it does. I think it will. I anticipate a few hicups, it's naive to think otherwise. And so what if you don't upgrade and flow in 2.5/5...is a figure such as 3-4/7-8 going to kill you? We're not talking about a flow to Sprit or JB or VA here. We're talking about a flow to an airline that will provide you with a multi-million dollar career and again, the largest airline in the world.
You want to go to Mesa, Blowjets or TSA and then compete with thousands of other applicants for a coveted spot at United or Delta (you can effectively kiss AA goodbye) be my guest. Take the advise of some internet blowhards who are bitter and quite honesty, idiots. Good luck.