I don’t share your optimism. Hispanics will turn states, and their culture is at odds with structured thinking. I’m not pulling that out of the seat of my pants. Half my family is Hispanic, and at one time I was a bit of an expert on Latin America for DoD.
If Trump were to tweet what you just posted we would never hear the end of it. Trump knows demographics as well as the left and is working most likely a delay plan in my opinion. There is one catch, prosperity. White people are also waking up to the reality of demographics - and and may be starting to have more children because for the first time in their lives they may understand that they also matter.
Hispanics are not in lock step with each other though. Hispanics I know have no use for illegals, and support President Trump completely, want the border secured and immigration laws enforced. Those I know are either native Hispanics or legal immigrants. Many Cuban Hispanics also support Trump.
Those that came here illegally or have family that has are not going to support anyone that supports enforcing immigration laws. Pandering to them does no good, they will vote with those that they believe support open borders, amnesty.
Hispanics that support open borders and amnesty can turn states, that is absolutely true, but we really can’t lump them all together. Deporting illegals, securing the border will help with that.