It is obvious to me, that Caesar planned to attack Dacia and Parthia. However, looking to his age and health, I doubt, that he intended more than pacify these borders by a kind of client-king or peace treaty after a won war. Those military actions are overrated anyways. Just running once around the Black Sea conquering the entire Near-East and Europe is fully nuts and leads to nothing.
I am more afraid about what happens in Rome, if Caesar is absent for a few years. Well, he can come back shortly during winter, while on the Dacian campaign.
Will the roman aristocrats accept lifetime dictatorship longterm? I doubt they will without a big slaughter like the proscriptions of the 2nd triumvirate.
How would Caesar deal with succession? Will he finally try to implement a real roman monarchy and replace the dictator by a rex?
What further necessary political reforms he planned?
Things could get hectic while he was gone. While he was away in Spain, North Africa, and Egypt, Antony, Dolabella, and others caused a lot of trouble.
I don't really think he intended to make his position hereditary. I see Caesar more as a person who intended to ultimately keep the republic-he was far more conservative than people give him credit for. It also shows in his will-Octavian, Antony, and the Brutus brothers among others were all given a stake in his will.
Even if he did intend to make a hereditary monarchy, I doubt it would last. He was almost 60 by now, and I'd give him another decade at most. That's not enough to really cement his position, especially since he is going to be away on campaign for at least a few more years.
Now what happens on his death? I think the republic has a much better chance of limping on in to the next generation. There are no conspirators to avenge, and people forget the legions were loyal to Caesar and his memory, not necessarily to any of his subbordinates. I think something like we saw at the death of Sulla would happen. Octavian doesn't have much chance to catapult himself to power, and Antony has to compete now with his rival Dolabella, and the Brutus brothers, Cassius Longinus, Lepidus, etc. Sextus Pompey will likely be pardoned by the Senate.
The Caesarion's weren't some cohesive group, and it was really only the common goal of avenging Caesar's murderer that kept them loosely together in the first place. They all had their own individual agendas. I think the conspirators destroyed the republic by killing Caesar, far from saving it.