system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Tony Stark goes back in time to when Tony thought of creating Ultron. He tells him of everything that will happen if he does it. Does Past Tony listen to his future self?
gpt
Yes, he would definitely listen to his past self. He's aware of how... extraordinary the MCU can be at this point, with Asgardians, aliens, and weird cosmic cubes. If there's one person Tony's going to hear with his full attention at this point in the timeline, it's himself. He'll probably try to ask his future self if he could add some alterations to Ultron, but he'd get shot down hard since Future Tony is guilt-ridden from Sokovia. 

So yes, this effectively changes the timeline for the better; or rather, this splintered timeline turns out much better than the prime timeline, given how we know MCU time travel works. Heck, even if Past Tony refused to listen, Future Tony would stop at nothing to prevent Ultron's creation and dismantle any efforts, *by force*, toward this goal.