Frankly, I think that this proposal lets Mexico off lightly. I would demand:
1) An abolition of restrictions on american citizens from owning property in Mexico (currently, no american can own property there....they don't want "foreigners" to buy up Mexico).
2) Bilingual ballots in mexican elections (if its good for the goose....)
3) Allow americans to attend mexican universities at the same tuition as mexicans (like mexicans currently get in state tuition at california schools...even illegals).
4) Affirmative action...which will make sure that white and black americans have an equal chance at jobs in mexico as do native mexicans.
This is just for starters...I know that I'll think of a few more as time goes on.
The reason that they're pissed is that they are used to making demands, crying "racism" and having a bunch of guilty white liberal gringos giving them whatever they want.
Biiiing! You get the prize.
With Mexico, it's always been "what's ours is ours, what's yours is negotiable" -- and the latest generation of gringos laid down for that, emboldening them further.
We'll see if a little generational spine is being grown in D.C.