Mike Hearn had a personal agenda against the Bitcoin Core developers because they didn't share his views about the future of Bitcoin development so he decided to call it quits and leave the team. I think his blog post was more of a personal vendetta against the Bitcoin community than a reasonable resignation letter. But as we can see the Bitcoin price has started rising even though the halving hasn't even started yet so I am inclined to believe that Bitcoin has a bright future ahead despite the droves of naysayers saying otherwise. Mike Hearn's anger and disappointment probably got the better of him but this doesn't mean that his statements hold water right?