TAX revolt and/or refusal to work.
I’ve heard postulations that even a large scale program of submitting extensions for income taxes would seriously cripple the government’s ability to conduct business - in this case, giving (squandering) away this nations wealth. Granted, one is ‘supposed’ to pay fair and reasonable estimations of what they owe, but whatever the penalty would be for incorrectly filing for an extension, it would still not be as bad, legally, as not filing and paying.
“TAX revolt and/or refusal to work.”
Won’t happen...but you might see some states start looking at bailing out of the union. It wouldn’t surprise me to see Texas looking at options.