ERA is 100% unable to predict future performance? That's new - you got a link for that? Because if it's not 100% unable to predict it, than one could value the stat. There might be other stats that have proven, more often than not, to be better predictors, but none of them are certainties. Quit talking like they are. This kind of tone with metrics is why so many of them have trouble catching on. Seriously, back down a bit.