No model ever is. I just don't see the assimilation problem posed by Hispanic immigration.
I have my own set of friends, customs, activities etc... I don't celebrate Cinco De Mayo but I have no reason to begrudge others who wish to. (I do resent being dragged onto the dance floor during a salsa song, but that's just the price one has to pay for not being Donald Trump).
I don't speak Spanish but don't fear those who do.
Crime is down in my area and gangs were suppressed long ago except for the Bandidos, and they've always been nice to me.
All my experiences with Hispanic immigrants have been positive. They are the predominant labor force in my area. They are paid well, and I can't imagine who would take their place if immigration were stopped.
Who said anything about stopping Immigration?
Do you understand the difference between legal and illegal?
Since you concede the model is inadequate, it's intellectually dishonest of you to continue to use it. If you want to make a case that concerns over assimilation of the current wave of immigrants are unfounded, you should make the case on its merits, on substance, using anecdotes only as illustrations and not primary evidence.