That’s pretty much how the Jetstar 787 operation runs. Norwegian also. The Cruise liner model. The Cabin Crew via an agency in Indonesia or Thailand. All ground functions via a third party. The only people on the airlines payroll outside of HQ are the two or three pilots up the front. We even saw one carrier in this country go as far as outsourcing its Safety Department to another country.
Some even go as far as recruiting FOs via an agency and bound them to a multi year slave contract, before dangling the carrot for a potential contract as a senior FO before a Command course.
The only people probably not outsourced in the future is Senior FO’s and Captains.