The idea behind leftist criticism of capitalism is that inevitably the greedy businesses will expand more and cannibalize the none-asshole businesses. Think of what Walmart and co did to local grocers. The heart attack (aka late stage capitalism) is the inevitable result of capitalists being allowed to accumulate wealth over generations and capture the system that was supposed to keep them in check, because fundamentally under a capitalist system money is power and the rich have more of it than you do. I honestly have no idea how to solve this, but the problem is a bit deeper than just a heart attack.