As the Mariners, if you want to win, what better time than now?
You have all your major talent with the MLB squad. No superstars in the minors, no group of great young prospects on the rise - all the big talent is already on the squad. You have big time hitters (Cruz, Cano, Seager), big time pitchers (Felix, Diaz, Paxton/Walker), and money to spend this offseason. We don't have a squad that's going to be filled superstar for the next 10 years. But we do have a squad that will be filled with superstars for the next 2, maybe 3.
I'd spend double or even triple what the proposed extra cash in the budget is - if the Mariners don't win in the next 3 years, it'll be another decade before that compete again (as evidenced by history), so save money then. Time is now. Spend it now.
We are wasting a great core of talent if we don't.