SD and LA Affordability Index: Probability of no crash…small

I like to see the posts about how RE can possibly not collapse since it helps avoid group-think and keeps people thinking. But, can anyone, either a true bull or simply a devil’s advocate spin with real data?
The chart above shows that less than 2% of LA and 5% of SD can afford the median price in their cities, while the House-to-Income ratios are about 9.5 and 7, respectively.
Both are way outside their historical means and blow away even the last peak.
With the fat lady in full glory on fancy financing–what Deus ex machina can you think of to forestall a major crash?
Massive inflation?
Boatloads of Chinese wielding US dollars?
Bill Gates buying Temecula on a whim?