The conversion is part of the license. It does not require the company to take any action.
The source is available with a restricted license, and e.g. two years later it relicenses itself to a FOSS license, automatically, as defined by the original license.
What happens if that time never comes for the company and it goes out of business?
The source code is available, and the conversion is automatic, so it doesn’t matter if they do go out of business
The conversion is part of the license. It does not require the company to take any action.
The source is available with a restricted license, and e.g. two years later it relicenses itself to a FOSS license, automatically, as defined by the original license.