I can attest that the people there are very hard working, I think most US citizens have no idea. At least this is true for people who are lucky enough to end up as professionals at the many factories that are there. Of course there are still many poor.

One interesting theory I heard about the entire Latin world (explaining why it tends to be poor) is that the old Spanish empire was deliberately modeled to be an extension of aristocratic Roman empire. The problem that this causes is too much power in the hands of aristocrats, with not enough space left for risk-taking entrepreneurs. To the degree that this is true (I'm not sure..), longstanding contact with the US may moderate it in Mexico in particular. Here is a video about it:

https://www.youtube.com/watch?v=efz4Aket2ao

There's something to that, in that even among successful Mexican immigrants, there seems to be a (relative) lack of leveraging that success into establishing businesses, or other investments that require long-term commitment.

Whether it's because of proximity, that so many come without family and/or plan on eventually returning home, or the related effect of so much of earnings getting sent back to Mexico every month, but there is definitely a cultural difference of some sort at play.

That is impossible to believe considering you can go to almost every corner of the US and see Mexicans and other people of Hispanic or Latin American origin working in hard, manual labor roles.

Maybe they are hard working as they have no choice. Majority of Mexicans work odd jobs. The auto factories there have huge training centers because of extremely high turn over.

Also due to a shoddy educational system and the fact that many drop out of school to work.

Absolutely no chance. Mexicans are incredibly hard working, but there's basically no way they'll become the next China.

Mind to list some issues in Mexico's growth prospect?

Mexico isn't poor enough, it is at the same level as current China. The main driver is that a country is way poorer than it ought to be based on other factors such as government efficiency and worker skill. In that scenario companies will flock to the countryin order to leverage the low wages, creating an economic boom which will last until the country is no longer a good deal for those companies.

Good luck getting the cartels to finance your factories, and then getting business anywhere the US has pull.

Our demographic bonus is over now and México didn't take advantage of it. Will never happen

Even without cartels, the corruption problems are huge. I wish them the best of luck, but the fact that an average family spends an integer percentage of their income on bureaucratic bribery doesn't give me warm happy thoughts.