The end is not near
Here's the way I see it.
Theories change as we learn more. This one sounds fine based on what we know now. Thw black holes they refer to are incorporated in the individual galaxies that will be drifting apart and theoretically they would be capable of consuming everything in their respective galaxies given enough time.
The key is this; If we happen to be around that long we will likely have the ability to create a new universe or alter the fate of this one. In the likely event that we are no longer in the picture, it becomes even more academic.