on "contending" - it all depends on who they hire as HC and GM. If the new HC and GM want to play a certain style of FB, and they don't think that they have the players they need on the current roster, there will have to be a lot of turnover.
the draft will be important, but if the Vikes want to get into the free-agent game, they have to clear up a LOT of cap space, and about the only way to do that is to trade Cousins.
so, unless the new brain trust gets lucky on a few deals, I don't see this team contending next year, and I'm fine with that - as long as the new HC and GM have a plan and can work together to follow that plan.
goes without saying - if they trade Cousins, then next year is either a rookie QB or a stop-game veteran on a short-term deal. that is not a recipe for a contender.