I think there's a good case for them re-releasing When In Rome on Blu-Ray because Pink Floyd restored and re-released the concerts from the A Momentary Lapse of Reason Tour and The Division Bell Tour as well. I hope Genesis would do the same thing with When In Rome, besides I've got an ad in my DVD copy saying they will be releasing it on Blu-Ray
"Deliciate Sound Of Thunder" needed major restoration. The concert was originally shot on 35mm film, and yet the VHS that came out in the late 80s looked like total garbage. They totally restored and re-edited the entire thing a couple years ago, and it's a vast improvement.
For "Pulse", they also recently re-edited, but the new version didn't improve much. They couldn't upgrade the picture very much as it was shot on standard definition tapes. The new version is redundant.
If "When In Rome" ever finally gets a Blu-Ray, they don't need to do much. It was already shot in high definition and was edited well. They could just release it, as-is. Hopefully in 4K too.
Again, I think maybe the issue holding it back was the exclusive deal with Walmart stores (in the US). I don't know if that was just for a set period of time or if it's permanent.