I think that if a company ceases support for a product for a period greater than 5 years (long enough for second thoughts), the product should fall under something like the creative commons license (free for personal use, can not be distributed for profit)
But if the owner resumes sales and support, then we owe it to them to stop distribution.
In otherwords, you abandon it, you lose control, you reclaim it, you gain control. If every 5 years a company does a re-release that it fully supports, I’d be satisfied with that.
Steve.