This should tell you how the market is developing.
Last years free agency class, only 1 pitcher received 6 years. Greinke (6/$147). Only one pitcher received 5 years, Sanchez (5/$80). And only one pitcher received 4 years, Edwin Jackson (4/$52).
Of the remaining pitchers, those that received over $10 million a year average. Lohse 3/$33, Peavy 2/$29, Kuroda 1/$15, Dempster 2/$26, Haren 1/$13.
Rivera 1/$10 and Soriano 2/$28 also received over $10, but they are closers.
http://www.cbssports.com/mlb/transactions/free-agents/pitchers