We should constantly appreciate how fortunate we are are, those of us software engineers. I am hoping against my expectation that somehow there will be good jobs in the future for more than the 1% (bio-medical engineering maybe?).
This only applies to a small fraction of engineers clustered in a literal handful of geographic areas. I personally don't know a single engineer in my country that makes $200k (and the cost of living here is just as high as any major US city). Earning half that is seen as a very good salary.
Logically it should at least not hurt the rest of the market, but anecdotally : during my time in the midwest, salaries were stagnant / sticky around $80k so I would caution against overestimating the trickle down effect of coastal income.