Not sure he's against gambling.

Looks like to me he's saying that traders are having a hard time accepting Bitcoin for trading due to the wild fluctuations and if Bitcoin doesn't get traction as a currency then it'll never succeed.

I can see why merchants would have a problem with the volatility.

I can see why speculators want to speculate.

In the grand scheme of things I'd say if you let the merchants do their thing first, Bitcoin gains traction as a currency, everyone wins. If you let the speculators do their thing first, there might not be anything left.