Hilton HHonors launched unprecedented Diamond status from any other loyalty program until January 11, 2016, the status being valid until March 2017 that LoyaltyLobby has previously covered here, here, here, here and here.
Hilton HHonors then launched a new campaign that is valid through June 30, 2016 (read more here), where the matched Silver, Gold or Diamond status is valid through March 2018 (essentially two years if you do it now). Hilton, however, has now retired this offer.
It is unclear why Hilton HHonors decided to end this status match promotion more than two months early.
It usually makes sense to take advantage of status match opportunities that sound almost too good to be true rather sooner or later. Companies can always decide to end them yearly as just happened with Hilton.
Some Hilton HHonors Diamond members were not too happy when Hilton was matching everyone with a pulse.