Thanos And the Time Stone

Can't Thanos do the exact same thing, now?

Sure, but there's no guarantee that Thanos would discover an outcome that would lead to his demise.

For all we know, if Dr. Strange would have continued his search through the future, then, he could have discovered another couple, or even couple hundred, different paths that lead to beating Thanos. Conversely, it's also possible that he'd never discover another single one..

Similarly, if Thanos were to look into the future, then, it's easily possible that he might not discover a future that leads to his doom until his 4 billionth trace of the future; maybe even 4 trillionth!

Given that there are literally an infinite number of "branches" that occur when searching through the future, really, Dr. Strange was extremely lucky to find a winning future in just 14 million searches.

At the same time, perhaps Thanos just doesn't have a motivation to do such a thing -- he's just obtained the six most powerful objects in the universe, is now the most powerful being himself, and, has just accomplished his ultimate goal.

My point is that is can Thanos override Dr. Strange's "Future"?

If he's able to find the exact same future that Dr. Strange saw, then, maybe it's possible, but maybe it's not.

This kind of topic usually invokes paradoxical arguments, etc., so I won't get into all that, but, in general, perhaps some futures can't be changed, regardless of a character's efforts to avoid it?

A classic example of this kind of story (where the character is aware of their future, makes an active attempt to avoid it, but by doing so actually fulfills their destiny) is the Greek tragedy of Oedipus Rex.

Dr Strange is not just some guy who picked up the Time Stone, he's an extraordinary mind, as Tony says a "wizard" and has mastered the use of the stone. Looking into the future to see all possible outcomes is something he can do with the power of the stone. There's no evidence that anyone who picks up the stone can do that without practice, or will even know it is possible.

Gamora (younger): Did you do it?
Thanos: Yes.
Gamora (younger): What did it cost?
Thanos: Everything.

Thanos's singular goal in life is to kill half the people in the universe, at random & mercifully so as the other half can live prosperously with the resources.

His goal is not to rule the entire universe or convert it into a dark dimension like Melakith.

He's an antagonist, who was shaped by his surroundings & decided to do something about it. No matter the cost, personal or otherwise.

After accomplishing his goal, he goes to Gamora's planet to see the sunrise, at peace, contemplating his losses.

As far as he's concerned, his job is over, the killings are irreversible. The attack on him by the Avengers will be a surprise attack. So he'll not have time (pun intended) to use the time stone to see outcomes. Even after, he will not need to. For the simple fact that the guy achieved his goals & lost everything in doing so (even his other children).

The key point is, as far as he knows, the effects of the SNAP are irreversible. He's an honorable man, a powerful one too & he would like to defeat the Avengers (if they seek a rematch) through his power & not with tricks.

With the release of Endgame, I think we have additional details.

As mentioned above, Thanos could search but he might give up before finding the one in 14 million where he eventually fails. Plus, as far as he is concerned he has won.

And as we saw in Endgame,

Thanos destroyed the stones, ensuring no one could use them to undo his work.

Strange didn't use the time-stone to look into the future and possible outcomes, just like the ancient one could when looking at the future. We've not seen the time stone itself be used to travel through time, only to manipulate time on a specific object (apple, page of the book and vision) or an area like to restore hong kong.