As Marx points out in Das Kapital, the capitalists will always capture government, defang the regulatory bodies, and then use financial shenanigans (fraud) for rent-seeking to make themselves insanely rich, but bringing their own economy crashing down.

This has happened across history multiple times.

The problem is barbed-wire. Barbed-wire is an early technology that allows large numbers of people to be controlled and contained by small numbers of people. We're developing all sorts of other tech intent towards the same goal. You've seen some already, with the mass surveillance state, ALPR and the recent move to take down Flock cameras.

China and EU are also buying big into mass surveillance technology, as a means for the capitalists to keep the working class from organizing.

That is to say, so long as we allow for a plutocratic class, and don't actively prevent it, it will pose a threat to democratic, rules based society. And eventually they'll win permanently, right before civilization collapses, they retire to their apocalypse shelters and humanity dies off.

Capitalism is non-viable. We may struggle to find something else that cannot be corrupted, but the consolidation of wealth and political power is baked into capitalism.

We need something else.