I don't think the deal will be nearly as sweet in Aa as it is with USDM. Fewer member airlines, fewer seats, more customers fighting for seats, less routes, less tricking dumb agents, more expensive miles, fuel surcharges etc.
Im enjoying USDM while it lasts and setting my expectations extremely low for Aa.
Certainly US DM has its opportunities compared to AA. Mind you, remember that the US DM member pool is very big, and US DM is one programme in quite a few many (include big ones) in Star Alliance. And US DM has deliberately prostituted itself out there much more to a degree than AA have.
And of the pool of airlines flown by the majority of us on *A, how many are there? TG, SQ, UA, OZ, TK, LH, LX, SA (maybe), NZ, NH.... and how many of those in F? (TG, OZ, UA, NH... the rest are unbookable). On
oneworld, there's AA, BA (yes, fuel surcharges), QF, CX and MH that have F (admittedly not on all routes) - admittedly, that small pool of F beats the bookable F airlines on *A to at least a marked degree.
I'm certain you're right to a degree on the fewer airlines and seats front, but it's not as drastic as you think. And even if it is as drastic as you think, then it's healthier that way than opening up every single seat for awards, especially in premium cabins.
As for "less tricking dumb agents", putting aside how crass that actually sounds, you are correct - AA agents are known to be some of the most experienced in the game.
And yes, the routing rules on AA are not as liberal as US DM. In particular, no stopovers allowed, but at least one-way awards are possible. This makes a nice combination with Avianca LM if you so desire (or even QFF for those burning away).
If you go into AA thinking that the "utopia" of US DM will continue, then you'll be most misguided. But... it's not like going from Switzerland to Swaziland.