Imaro
Legend
They are not giving their product away for free. The SRD is not the PHB + DMG + MM. It is the bare minimum example of D&D so others can create D&D compatible content. Sure you can play a basic version of D&D with it, but the PHB contains a ton more information, so pretty much no one does, and WotC knows that.
It's funny you claim this seeing as how Mongoose Publishing was literally able to release their own PHB for 3.5 (at a cheaper price point) using the SRD and OGL. I would also note the numerous retroclones (literally WotC's previous games) as well as new games (many which are fantasy... Pathfinder) that have all been created using the SRD and OGL. But yeah I guess they aren't actually giving their product away.
As to expecting them to not revoke the OGL, damn right I expect them to, they told us for 20 years that it is irrevocable.
I didn't comment on revoking the OGL... I was speaking to whether the OneD&D SRD would be open, so I'm not sure what you are addressing here.