The key will be the insurance companies....Sadly they only provide cover on historic past track accident records...so people will have to die if this imagined new improved idea of producing pilots fails to work..and insurance companies at last show an interest in the quality of crew licences and training..it really is risk management for big money for everyone concerned..except the poor Captains stuck with no experiance in their right seat.
Given a thouroughly experianced Captain a weak on experiance f/o can be carried on flights... he should not have to be... but it is a fact of life some flights with brand new f/o are single Captain pilot IFR whilst the new guy plays catch up...everyone needs to help eachother achieve and this generally flows left seat to right seat..or should do whilst the new f/o matures and learns line handling flying...incorrectly crewed up experiance levels result in a series of Gf airbus type incidents some of which are fatal...no aircraft can be briefed to not bite any level of experiance pilot...when an f/o can do his right seat duties halfway decently then he can be given the responsibility of learning takeoffs and landings on line flying where the freeze button is death.
Line training Captains will probably have a vastly increased work load and responsibility...it will all be good fun for them and the new students in the real world weather and 24/7 max duty min rest line flying.