This has been the longest interval between releases in the history of that product line so I would agree with Macrumors on their recommendation to hold off buying:
https://buyersguide.macrumors.com/#iPad_Mini
Having said that if you look at the history of the main iPad line there was a 2 year release gap at one point so it's not unheard of for them to sit on it if they don't have anything reasonable to upgrade it with.