Great topic TB.

I will go to my grave believing, as I've posted several times, that Michael blamed Tom for the Corleones near demise: Sonny's murder, Vito's near-murder, his exile to Sicily, his involvement overall in the family business which he had previously eschewed, and, in a perverse way, his having to murder his brother.

Michael took so many opportunities to hurt Tom: "Why do you hurt me, Michael?" in that scene. Previously, "You know my lawyer, Tom Hagen." followed by "He only handles specific areas of the family business."

So, in answer to your question: yes, he would have.