Once upon a time there were milkmaids. They milked cows. As times changed, milking cows was more automated. Milkmaids were out of work.
There's about 47,000 IRS employees. The only ones crying about them being out of work would be them and their families. As for the tax services of HR Block, etc, all of a sudden there will be a lot of Americans who are getting their full paychecks instead of "take home pay" and a sizeable percentage of them just might want to invest their money and need financial/investing advisors. HR Block could adapt to the changes or die as a company.
"There's about 47,000 IRS employees."
I believe it's more like 100,000 and their budget is in the neighborhood of $10 billion/year. That is actually small potatos compared to the compliance costs savings of hundreds of billions of $$$.