Employers already need to prove that they can’t hire an American to do the job.
[1] https://www.dol.gov/agencies/whd/fact-sheets/62o-h1b-recruit... [2] https://www.propublica.org/article/trump-immigration-h1b-vis...
It is true that the LCA (and PERM!) processes are have grave flaws that leave them open to abuse.