Blindly suggesting that others should follow suit is pretty short sighted. The Orioles seem to be following suit...they refuse to rebuild. You follow them and let me know how that works over the next 5-10 years...
Teams are all using advanced projection systems and now have a much better understanding of where they are on the "win curve". Teams with a 5-10% chance of making the playoffs are no longer going to go sign that aging, declining vet to a long term deal - which hampers their future - for such a low probability of success. They've also learned that adding that vet only increases their chances by a percentage point or two.