You may find it interesting to read the book Whiteshift - https://www.amazon.com/Whiteshift-Populism-Immigration-Futur... . The thesis of the book is that over time, Hispanic and Asian Americans will start to be considered white, similar to how the perception of Irish, German, and other nationalities changed in the 1900s.
As an Asian who has been to the USA, I find this to be highly unlikely, especially considering that Asians (East Asians, not Indians) are not even Caucasians. Whiteshift happened because all those nations (Germans, Irish, etc.) are of Caucasian European stock. Maybe it could work with Hispanics, but even that is a stretch. Many of us don't want to admit this, but our brains are wired to immediately understand how much genetic history we share with another person just by looking at them.
You make a good point, but in the past the same argument was used to say that Slavs or Latins (southern Europeans) would never be perceived as the same race as the people of Germanic descent. I think you're right that Hispanic is closer, though. Think of Hispanic people like Ted Cruz or Marco Rubio, are they really perceived as so different from white? Also, speaking to your comment that you are an Asian that has been to the USA, I want to mention that the author of the book is partly of Asian descent himself. If you're curious to read it I recommend it!
