CERN & NASA are part of the Open Source community.
Continuity is assured.
It is not unusual to mix Open Source & Proprietary products.
Open Source already quietly delivers most of our security, telephony, web sites, emailing, file sharing, and more. Then there are applications developed using Open Source which give us sales and marketing tools, contact management, accounts, payroll, office suites, etc. The list keeps growing.
What's more, Open Source doesn't impose a subscription in perpetuity.
We are no longer obliged to surrender our independence forever.