Then any 3PP which has been relying on the OGL for its entire product line has the ability to safely continue that product line.
And we, the community, have the ability to easily create and support a 5E-based D&D clone, in the event that Hasbro does something catastrophically stupid and destructive with D&D.
And if 6E is a good game, we get that too. (If it isn't, see the previous point.)
It'd be nice to have 6E released under an open license, but it isn't necessary. All I ask is that Wizards lives up to its past commitments with the 3E and 5E SRDs. I don't expect them to do so in the near term... but given that they appear to have once more succumbed to the madness that periodically afflicts D&D's corporate owner, which inevitably results in a crash, I have some hope that they will come back to the open gaming community when the time comes to rebuild.