If the affluent are forced to use the public school system, the schools in their neighborhoods would be awesome and the schools down the road in the less affluent part of town will remain just as bad as they are now.

Look at Saratoga High School and Lynbrook High School, in Silicon Valley not far from Palo Alto. Huge funding. Donations of equipment from local tech companies. Fundraisers run by rich parents. Great facilities.

Yet schools 20 minutes away in the less nice parts of the Bay Area are still terrible.