Capitalism has never been useful, other than to those who control it and has enslaved humanity for several centuries.
The sooner we are done with it the better and although, (as McGrath notes) it is not dead, it's unsustainability is becoming apparent to all.

When Capitalism goes into decline,we should guard against the next phase which is "Police State" then outright Facism. Within year or so we should see the first signs of a clampdown on protest as job losses and erosion of living standards begin to bite.

    "Freedoms are being lost in Britain because of the rapid growth of the "national security state." This form of militarism was imported from the United States by New Labour. Totalitarian in essence, it relies upon fear mongering to entrench the executive with venal legal mechanisms that progressively diminish democracy and justice. "Security" is all, as is propaganda promoting rapacious colonial wars, even as honest mistakes. Take away this propaganda, and the wars are exposed for what they are, and fear evaporates. Take away the obeisance of many in Britain's liberal elite to American power and you demote a profound colonial and crusader mentality that covers for epic criminals like Blair. Prosecute these criminals and change the system that breeds them and you have freedom." John Pilger.