A future GPL v4 could say "Your code can be converted to the MIT license", or even "your code can be used by company X" in the event of a takeover (which I don't consider an impossible option).
> "your code can be used by company X" in the event of a takeover
The FSF is a tax-exempt 501(c)(3) charity; if it would institute policies to benefit a single for-profit entity, the inevitable IRS audit would be excruciatingly painful and likely result in jail time for directors.
