I actually think there is a possibility that it could be easier to get into US as highly skilled migrant under Trump presidency because of his anti-immigrant polities. If he raises a minimum income bar for H1B to 150K and keep the same cap, then it would be much less qualified applicants for H1B visas and therefore there would not be cap overflow with annoying lottery process. Of course, I can't predict what Trump is…
You confuse skill with high salary. If you're a part of HN community and work for a startup with some seed funding, good luck with (a) finding people (b) paying them $150k. Not sure how you the want government to evaluate chemical, mechanical, aerospace etc. engineers. Right now it's formal education, since I think it's hard to do it objectively otherwise. For software engineers you expected USCIS will look at our ..…
Skill is too difficult to define objectively and it's probably not what you should be discriminating on anyways (in a purely economic sense).
What you need to go for is "valuable" (scarce and in demand) engineers and salary is a decent proxy for that (more so than formal education). You also don't want the government to "evaluate" engineers because doing a good job at that would mean, pretty much by definition, selecting the very same engineers companies elect to hire.