BCH is next in line to have a real life capacity test. BTC and eth have already failed and their price collapsed with it. I ignore xrp cause too centralized
BTC and ETH reaching capacity and then price collapsing are not correlated because the one caused the other but because of a shared cause (a speculative bubble mania which then burst)
Status ICO and cryptokitties stopped price rally at highs for ETH as network failed. BTC crashes every time at new highs fees 25%+ for years. Great predictor for BTC price high.