Currently Online 
I'd not be surprised if we even see Ubisoft eventually dump all their internal engines and move over to Unreal Engine, if someone acquires Ubisoft then sadly one of the easiest layoff and cost-saving measures will be to dump all the dozens of engine teams, dump the engines themselves and move over to Unreal Engine. Could probably shave off hundreds of employees from that alone.
And it'll also be beneficial to moving Ubisoft like other publishers, that is, laying off thousands and instead of developing everything in-house they like other publishers start using cheap outsourcing, using cheap outsourcing is a lot easier when the external developer doesn't have to learn an entirely new engine they've never worked with before.
We're just going to see more and more proprietary engines die (at least in the AAA space) as Unreal Engine becomes stronger and stronger.
