To me, signing a top 2-3 FA will happen, at some point, and maybe this coming winter, but the thing we might need more than that, and what I feel is a "longer shot," is to make a blockbuster trade for an ace or ace-to-be.
It has been our signature trademark since acquiring Pedro, before Henry & Co. arrived. Adding Schilling, Beckett and Sale provided major pushes to subsequent ring seasons. Adding lesser guys like Porcello, Peavy & Nate via trades made a difference, too, but the blockbusters were needed, IMO.
Yes, the Price and Lackey signings helped, too. Yes, the farm providing Lester and fodder for trades helped, too, but it was the trades that won us rings. No trade- No rings!
Now, this doesn't mean it's the only way to build a ring-worthy rotation, but IMO, we will not be signing Ohtani. (That being said, the chances we trade Mayer or Casas/Rafaela/Bello are very slight, too.)