Might be a small market for that sort of thing.... I don't think I'd be a buyer, being honest.
I'm hoping we can get maybe some Kris Kristofferson, Mountain, The Youngbloods, Michael Nesmith long before we have to start dipping into Perry Como, Johnny Mathis or Andy Williams.
It would be nice to know definitively what happened to the DOT/ABC stuff. I know there's tons of rumours surrounding it and even I've been a proponent of the "It's all been dumped" conclusion. But, I'm not an industry insider with access to vaults. Some stuff has appeared on eBay in the last few years. It would be interesting to get in touch with some collectors who have duplication masters, borrow them to make digital copies and then approach the copyright owners with some good news!
If it's not too much trouble, maybe run a search for stuff from Donna Fargo or Roy Clark. Some of those albums are fun, with very nice Quad mixes, but also I don't think their albums are available in the digital domain. So, they're ripe for remasters and judging by how popular Hee-Haw still is on Youtube, D-V might-could corner the market. Or, I suppose, worst case Ontario.... at least we get some neat stereo remasters.