The reason why I had questioned the need to bring in Captain Marvel is that Thor is still alive.
I once came across an article that listed the number of Marvel characters capable of defeating Thanos. One of them was Odin. I suspect that other lists either do not include Odin . . . or include the Hulk (who got his ass handed to him in the movie by Thanos). So far, I have yet to see Captain Marvel on any of these lists.
Then again, I haven't seen Thor on any of these lists. But . . . Odin is dead. So is Hela, his older sister. This leaves Thor as the current ruler of any Asgardians still alive (if they are) and . . . the new Allfather. And considering how he came damn close to killing Thanos in the movie, I find myself questioning the need to regard Captain Marvel as the only one capable of killing Thanos or as the universe's only hope. Now, it is possible that she possesses an ability that allows her to find Thanos. If that is the case, I could see the need for her presence. And it is possible that Fury was not aware that Thor was back on Earth.
There is a problem with this scenario. At the beginning of the movie, Thor is depicted as being no match for Thanos. Yet, he was easily able to come close to killing Thanos in Wakanda. Some might attribute this to his possession of the Stormbreaker. But why? Didn't "THOR: RAGNAROK" establish that he never really needed Mjölnir other than to help him learn to focus his powers until he was ready to wield them without a weapon? So . . . is the creation of Stormbreaker is a sign that Thor has not yet learned to focus his powers on his own?
But with Stormbreaker or not, he strikes me as being powerful enough to take on Thanos.