Well the stage is certainly set up for it to happen.
Feige has gone on record stating captain marvel will be the strongest character in the universe that they've had on film. Does that mean stronger than Thanos?
And the flack that they've gotten for taking this long to have a female hero + the success of wonder woman means they will want her to make a huge impact.
So,I would not at all be taken aback if captain Mary sue is the key to beating thanos.
Being pushed to the moon even when people don't want it is pretty much a staple of her role in marvel for a while now.
But who knows. not saying any of that will happen,just that it wouldn't be a shock if it does happen.
Just so we are careful with our words. We are saying she is the strongest in the MCU that has been on screen so far? or are they proclaiming her officially the strongest in the MCU?