No one is going to replace the H1Bs because they are to well entrenched.

I can see the pushback but the H1Bs, mostly indians, stick together. Last year the company I work for added an indian guy on one of the infrastructure teams, one year later is almost entirely indian and actively keep non-indians away. Stuff like keeping them out of the loop, not sharing information, take forever to approve new permissions or accounts so that they underperform, create a system where they applaud each other for basic stuff. I've seen this behavior in the last 2 jobs. There is no stopping it once it starts.