There are other ways to implement a "win now mode" without sacrificing your ability to sustain success....
As a fan - I looking for sustained success, not a one year wonder. I realise it's difficult to keep looking long term and that sustaining success is challenging in the majors, but let's be honest - teams do it (St. Louis, SF, Boston, Angels, A's, TB - all have over the past 7-8 years)...and I could be wrong, but I don't think they achieve this by making short sighted decisions to sacrifice the development of their top young players to try and win in a particular year. Just my thoughts.