The term "legacy resort" is generally used in reference to facilities of "older vintage", typically bulit in the early to mid 1980's and usually "independent" timeshare properties (i.e., seldom associated with any of the big corporate "chains" such as Wyndham, Marriott, etc.).
Definition aside, I must disagree with the overly broad statement made and quoted above that "legacy resorts" have little value. The weeks we own at
two different "legacy resorts" in coastal SW FL have maintained their value quite nicely, having at least the same (or slightly higher) market value today than we paid years ago (resale, of course) --- and well above the "$1.00" figure cited above (consistently in the $4.5k to 6.5k range, based upon numerous resales observed over the years).