Plenty of us would take a Joni Mitchell set on its own, yeah? And I forget how many Gordon Lightfoots (-feet?) and Jackson Brownes there are, but maybe at some point Rhino would consider two-fers of Randy Newman and JT...
I’m pretty sure none of those artists have enough Quadraphonic mixes of their own to warrant a dedicated box set, but besides the possibility of any of these Quadraphonic mixes appearing in deluxe editions, maybe Warner/Rhino could start licensing out some of these mixes to Dutton Vocalion.