Honestly, unless these ML bootcamps are extensive courses on calculus, linear algebra, and statistics and not just "Here's k-means. Memorize it" I doubt they'll harm the market for grad school educated data scientists.
I completely understand why there is such a stigma around bootcamps. Nobody can deny that they don't afford the same depth that you'd get at a "real" program. But they can be amazing for career switchers like me, who had no real direction in college. Don't look down your nose at them.