Although I can see the advantage of having a digital label in a lot of cases, I don't see the necessity in a museum environment. There is serious human interaction necessary to change the collection to move and change the works of art. It would be easy to change the label at that time.
What use case is there to change the label "on the fly"?
How about showing different slides to show more text. Imagine it rotating between 5 blocks of text. That's 5x the information you can display. I'm usually disappointed by the tiny amounts of texts those little placards show.
Say you want to change a descriptive text, because there is a typo or maybe you just have 10 mins to spare and want to expand something. Currently, you type your text, print it somehow (often on laminated or plastic material, but might be more much complex), then walk to the work at the other end of the goddamn gallery (because Murphy) and replace the label.
With a networked display, you click on an icon and type your new text. Done.
And of course, if the label becomes a hypertext, the possibilities are endless; but that will not scale well in busy museums where you can't have anyone hogging the screen for minutes.
If you have n signs with different languages next to each other then everybody can read the sign at the same time. If you have one sign that can switch between n different languages then only a subset of the people there can read the sign at the same time.
What use case is there to change the label "on the fly"?