Something I have always believed, too.
But....
History has shown those contracts do get traded. Stanton, A-Rod, Cano, Price, Fielder, Verlander, Greinke, Kemp, Manny Ramirez. These were all among the largest contracts in the game when signed, and all of them were traded mid-contract. And I bet I forgot about one or two names.
Of course, most of thir deals have been eclisped in the past 3 years by Trout, Machado, Harper, Rendon, Cole, etc. But I would imagine some of those deals will get dealt as well. (Machado will get traded. Book it.)
So.. will Mookie play all 12 years in Dodger Blue? I wouldn't bank on it just yet....