Again - there is nothing about hiring anyone full time in this law at all - that is completely your fantasy. The law merely classifies these folks as Uber employees since that is what they are. Nothing more.
As part time employees, Uber will not have any laws requiring them to pay medical benefits (though of course they can take a responsible attitude if they want for employees who don’t otherwise have insurance). They will be required to pay California’s minimum wage, and to collect and pay payroll taxes as appropriate.
Uber operates in 60 different countries and in several of those, their drivers are now classified as employees by law. Yet, they have not scheduled those drivers as you say they will in California - so I see no evidence for you assertions whatsoever (Though, in the UK, they have required their drivers to take a break after 10 hours of continuous driving to avoid accidents caused by fatigue - a positive effect of having the rextra esponsibility of their drivers being employees).