You might not know this but Black Panther 2 is already in the works and will reunite almost every key player of Black Panther 1 and of course, will feature T'Challa too. Chances are Black Panther 2 will release post-2019.
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The super sorcerer played by Benedict Cumberbatch also had to sacrifice his own life to make way for a safer future. It's important to note that Strange is a key player in the Avenger storyline and he allowed that many disintegrations as he could envision that they are necessary in alternate dimensions.
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It is important to remember that Dr Strange can see through time and space which makes time travel an important aspect of Infinity War. Strange saw that the only way to defeat Thanos is if some of the Avengers disintegrated only to be brought back eventually.
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