I'm no expert at what goes on at Wonderland behind the scenes, but in all of Wonderland's history, they have only dismantled one roller coaster so far.
Flight Deck of course is not nearly as popular as it used to be. I mean within the Paramount era, arguably Top Gun was the star attraction of Canada's Wonderland right until Cedar Fair took over. I have a personal bias against Time Warp and personally would like to see it go, but I don't see it leaving anytime soon.
I could be wrong, but I think out of newer rides, say from Paramount ownership onwards, only really Sledgehammer has long maintenance. Even so, it doesn't seem to have as many problems as a ride like WindSeeker does.....I even saw WindSeeker malfunction last Saturday.
For the most part, Wonderland has made uncanny designs to fit more recent roller coasters in, sure the Skyrider was removed in 2014, but I wondered before, how such rides like Behemoth or Leviathan were possible to build without compromising rides. I'm sure Wonderland doesn't want to remove any more roller coasters unless they REALLY have to.