If the reporting requirement was implemented, yes it would provide the IRS with more data that could be used to catch tax evaders. However, they should be able to get nearly all of the information they need from the USD-BTC edges (exchanges).
Effectively, I think what would have happened if this was enacted would be that all legitimate mining operations would move out of US, and the IRS still wouldn't get much data, just less tax revenue because those profits are no longer occurring on US soil by US entities.
Effectively, I think what would have happened if this was enacted would be that all legitimate mining operations would move out of US, and the IRS still wouldn't get much data, just less tax revenue because those profits are no longer occurring on US soil by US entities.