I would hope that if they ever are released on bluray, they would be in their original language with English subtitles. Most of the Italian ' swords and sandles' and biblical films were usually horribly dubbed when they were originally released.
Maybe Disney think that some films don't age well and would have a limited success if they were released on Bluray. SWISS FAMILY ROBINSON was ,at the time, a huge success as was 20,000 LEAGUES. THE BIG FISHERMAN only had a limited release in 70mm and would unlikely appeal to...