What would've happened if Anakin killed Obi-Wan?

The fight between Obi-Wan Kenobi and Anakin Skywalker, also known as the Battle of Mustafar, is a pivotal moment in the Star Wars saga. It takes place in “Star Wars: Episode III - Revenge of the Sith,” the third film in the prequel trilogy.
The battle is the result of Anakin Skywalker’s fall to the dark side, which was orchestrated by Emperor Palpatine, also known as Darth Sidious. Anakin, believing that he can save his wife, Padmé Amidala, from death, allies himself with Palpatine and is given the name Darth Vader #anakin Skywalker #darth väder #obiwan

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And Luke still could have been a jedi, he trained fair longer with yoda who still would have been around