Beware assuming trends will continue forever. The dem party survives by providing goodies. This ability ends eventually, as the California bankrupt cities demonstrate.
LOL So when do you estimate that CA will become a bastion of Rep voters? Right now, CA is becoming more and more Dem. It won't be long until you can count the number of CA Reps in Congress on one hand. And CA is a lock for the Dems in the Presidential elections.
By 2050 the demography of the US will resemble that of CA.