All that’s going to happen is that the true $800k buyers will simply adjust their expectations upwards as the options to do so present themselves.
This trend is working its way from the outside in. These newly developed areas will be among the last, but if the trend continues they will eventually fall nonetheless. Gravity is a law of nature.
Everything else being equal, when SEH homes are selling at $500k, the equivalent home in 4S Rancho isn’t going to go for 30% more just because it’s in 92127.