Although it was almost constantly on the mind of Eisner in the early 90's to "cement" the image connection of Old and New Disney with a Walt-era sequel and validate the regime change--
Problem is, back then, they (get this! ;) ) didn't know what old Disney movies were open-ended enough to be...
In fact, story goes that Walt Disney liked the Julie & Dick pairing so much, he wanted to work on "The Poet & the Nightingale" next, with Dick as Hans Christian Andersen and Julie as Jenny Lind.
But by that point, both stars had become WAY too big on the success of Poppins for Disney to have...
Uh, "Snoopy Come Home" was a movie, in 1972.
Another interesting factoid is that Glynis Johns and David Tomlinson had already worked together, in 1948's "Miranda". (Although in much different contexts. ;) )