That could be a serious issue if you're just relying on your nodes having beefy hardware. It's a lesser issue if you can support a large number validating node

That could be a serious issue if you're just relying on your nodes having beefy hardware. It's a lesser issue if you can support a large number validating nodes using cheap hardware, they are frequently and randomly assigned to verify different portions of the history, and they always act as secure light clients of the other portions. In fact, it might even compare favorably to the handful of major mining operations that mostly run Bitcoin, on expensive ASICs.