When he resigns, loses an election, or dies, obviously.
I know it’s hard for people who live in capitalist bourgeois democracies to imagine that a president could sustain popularity over a long period of time. They’re used to getting fucked over, election cycle after election cycle, because their governments don’t work for the majority, they work for the capitalist class. It’s a big club, and you ain’t in it.
All you’re doing is repeating your assertion without adding anything, and the assertion you’re repeating is the the one you received from a lifetime of Western capitalist Cold War propaganda, and I don’t think it’s ever occurred to you to question it.
Chinese people have many material reasons to be happy with their improving lots in life over the past several decades, while the lives of people in Western capitalists states have been deteriorating over the last ~40 years of grinding neoliberalism. So it’s no surprise that people in China might want more of the same.
Putin actually is popular. Russians have good reason to like him: he kicked the Western capitalist neoliberal shock therapy plunderers out of the country. It’s still a capitalist shithole, but at least it’s their shithole and not a neocolonized state anymore.