The homes in 4S are in the middle pricing tier of the Case-Schiller index. The median pricing for that index is comprised of high and lows throughout the region. The homes in 4S and other nearby communities obviously represent the most desirable end of that pricing tier.
When considered in context, 4S is doing just about exactly what you would expect. They haven’t gotten to Temecula-style pricing drops yet because they’re extremely close (relatively speaking) to meaningful employment.
By the time this is all over, I think 4S will end up looking more like Poway and Scripps than San Marcos and Escondido. People will consider it closer to being a destination as opposed to just another rung on the property ladder.