Having BluRays of this would be worth it for if they included "full" unedited shows (mostly just for the cover show and the acoustic show, and perhaps as a bonus, as to not interfere with the original "classic" feel).
Reissues would be nice for full unedited shows anyway. The question is, are the shows recorded on film or video tape. I'm pretty sure for the LiT show, it was film, so it would make sense to do a Blu-ray/HD reissue. But I'm pretty sure that at least some of the source material for 5YiaL and CiM were shot using standard definition video tape. So in those cases, it wouldn't make sense to reissue them - whether segmented as on the original release or as full, standalone shows on Blu-ray/HD since there won't be any benefit.
For the 1998 shows in Rotterdam and Paris, I believe they were shot on film, and if so, it would make sense to reissue them on Blu-ray/HD. But in both cases, I know there were some botched performances that couldn't be salvaged by minor post-production in the studio, and knowing what a stickler JP is for perfect performances, I can't imagine he'd ever sign off on either of those shows being released in their entirety.