Ionic Framework and Capacitor aren't affected and remain open source and are actively maintained by the team. In fact Capacitor is growing faster than ever.
Unlike most shutdowns, this one comes with a migration path: Ionic partnered with Capawesome to move customers over.
For Appflow, there's an export/import flow that lets teams migrate their apps, channels, environments, signing certificates, destinations, and automations without having to rebuild everything from scratch. Teams can also run Appflow and Capawesome in parallel while they make the transition.
More details on the migration: https://capawesome.io/blog/announcing-partnership-with-ionic...
Disclosure: I work at Capawesome as a Developer Advocate. Happy to answer questions about the migration.