Well arguably H-1B is being abused specifically to lower wages. I think we're aware especially given the contrived ways of circumventing how H-1B is supposed to be used like deliberately advertising jobs in an obscure print newspaper that doesn't even get circulated or modifying the job description to suit an international candidate alone.
But for me, a larger concern is elite overproduction (https://en.wikipedia.org/wiki/Peter_Turchin#Elite_overproduc...). We've basically massively expanded the number of highly credentialed people in the country and this might not be a good idea.