Why not move to an on-demand printing model, I wonder? I can understand not devoting a large amounts of resources towards typesetting and storing new editions, but it does seem (at least from the comments here, and anecdotally elsewhere) that people enjoy older editions as objects d'art. There might very well be a market for selling, eg, "new" 1912 editions if you can avoid the warehousing overhead and ship them direct.

Licensing opportunity, perhaps?