> Seems like a good business opportunity for someone to open a software-selling business in all 50 states, take .5% of sales plus add necessary tax depending on buyer address and deal with the sales tax.

You'll need to compete with incumbent providers, including Intuit's TaxCloud, that do this free of charge (for retailers, they do get money from the states) for multiple states. (Currently, only for the 24 states that are part of the Streamlined Sales and Use Tax Agreement, but under the terms of the new bill, those would be the exact states that would be qualified to collect remote sales taxes without doing much new; certainly, those same incumbent providers are going to be adding support for new states as soon as they start either joining the existing Agreement or meeting the requirements, including establishing certification procedures for software providers, under the new bill for states that aren't part of the Agreement.)