A permanent Republican majority will need 70% of white votes and at least half of Asian and a third of Hispanic votes, with a strong replacement dynamic (i.e., young white voters trending strongly Republican, and young Asian and Hispanic voters not trending hugely Democrat). There is a LONG way to go to achieve any of these targets.
Unless the repubs can bring industry and jobs back to this country, they will NOT hold control in both houses for very long. Where will the tax money come from if fewer and fewer people are working? Now that we have millions of non-skilled illegals within our boundries, what skills did they bring with them? Few I would expect. No, we need INDUSTRY back and workers capable of rebuilding America. IMO, then and only then will republicans hold onto control.