So there is something I have been thinking about for a while...IK a lot of people think that at the end of the manga Takemichi is gonna die and Mikey will be able to live life in the future but honestly I doubt that will be the case.
We know that Mikey envisioned his future with Draken and Emma, laughing . This boy values his friends and family above all else and it's part of the reason why the Boten future happens, he walks the dark road to ensure that the people he care about can live a happy life.
If Takemichi were to die for Mikey then I honestly think that nothing in the future would change. Mikey has at this point in the manga lost most of the people he care about. His older brothers, his sister, Baji and now his best friend. The alternative futures were caused, in part, because Mikey was alone without his family to support him and was hence susceptible to his dark impulses.
Mikey sees his older brother is Takemichi (I don't remember the chapter number but uk what I mean) so while I want Mikey to have a future where he can be happy and at peace at this stage in the manga and with what we know so far I don't think he is going to.