Why would you bother (or not bother, as the case may be) with the digital version of you already have the Blu?
To get the sweet new screwed up fanfare of course.
I’ll play Devil’s advocate and say that there are some pretty good bonus features unique to the digital versions. That being said I don’t see how this would “replace” the digital versions in that case, since it’s not like those bonus features have anything to do with Revisited.