If Scheiner had completed mixing ALL the Zep Albums in 5.1 then we might have a 'fighting' chance of seeing them released collectively but since he's retired, doubtful he'd ever agree to complete the project.
And with Page and Plant in their 70's, doubtful they'd have the ambition/stamina to oversee individual elaborate boxset releases of their undeniably superb creations....unless they were strapped for CASH....which is doubtful!
BTW, Page is 73 and his current net worth is $170M.
Plant is 68 and his current net worth is also $170M.
Neither Age nor $Millions stopped Ringo, Macca, Yoko, Olivia, from pleasing Beatles Fans.
I kinda think Page is a not quite yet bored Septigerian . Only time will tell , but every year becomes a missed opportunity.