There is no evidence he ever asked for a permanent dictatorship. If you look at the reforms he instituted, they were dedicated to reforming, not destroying, Rome's political fabric. I think the "Dictator for Life" was foisted on him by the Senate in order to further the idea that he wanted to make himself a king.
If you go back to the beginnings of the conflict with the Senate, all Caesar ever asked for was to run for consul in absentia, serve out his term, and then go east to conquer Parthia and regain the eagle standards lost by Crassus.
We'll never know, really, barring the discovery of more detailed ancient records of the era.