For one, good tech workers are hard to find anywhere. A candidate needs a range of attributes to be effective at this type of work. That type of talent is hard enough to find in the western world, it will likely be just as hard to find in the east.
Two, Indian tech labor isn't that cheap, a conclusion I draw from my own anecdotal experience. My first job was working for what you may call a "body shop" that was US based with US only employees. The owner started the business after doing sales for an off-shore, India-based "body shop," and he did it bc cost of labor was approaching the cost of labor of US workers, and the US workers would tend to produce higher quality (less defective) work (his words, not mine). No idea what the details were, but he has a thriving business.
Finally, there might be a lot going on right now, but why haven't companies outsourced sooner when there was nothing stopping them (even visas were easier to come by before Trump)? I believe they have contemplated it, and changed their minds for good reason.