Only the founder of the Home Assistant project can definitely answer that question. However, based on past events, it seems unlikely it will be deprecated in the future.
Here’s the community’s response to the first (and only) time there was an attempt to eliminate support for Home Assistant Supervised installation.
The ultimate decision was a compromise and official support for Home Assistant Supervised installation was limited to just one distribution of Linux (Debian) and not for any other. The decision was officially documented in ADR-0014.