TBD --- Five years is a long time on Broadway, but Wicked, Phantom, and Lion King aren't the only ones that have been open for close to/over five years.
Avenue Q (6 years)
Chicago (13 years)
Jersey Boys (4 years and still selling over 100%)
Mamma Mia (8 years)
Obviously there are a dozen shows that close within a year for every show that has a multi-year run, but most of these predictions are still pretty plausible IMO. Also, most of the shows listed have either recouped or are on their way to recouping, which makes a multi-year run more possible.
Wicked Tour (2/26/08); Wicked Bway (7/1/08); HAIR (7/1/09); Rock of Ages (7/2/09); Wicked Bway (7/3/09); Mary Poppins Tour (8/2/09); Wicked Tour (11/18/09); Wicked Tour (12/5/09)