Kinda have that already, at least in GA. If you make an online purchase and there is any brick-and-mortar presence in the state, the store itself assesses the sales tax.
The vendor I like best is somewhere in the west and they employ people with mild mental disabilities to package and ship the books I order. I think it is a win win situation for everyone and the state can't waste the tax income like they do everything else.
This one is new. The bill targets Amazon and other big-name sites, by making them charge tax is they have any AFFILIATED SELLERS have a brick-and-mortar presence in the state.