Schwab’s new ETFs solve one critical problem in the ETF market, but they won’t take over the world. At least not for a while.

I’ve been thinking about the Schwab ETF launch all week, trying to figure out if it’s a game-changing event or an overblown bit of marketing. I think it’s a bit of both.

The big news, of course, is that Schwab is entering the ETF market and breaking new ground on fees. It has launched four ETFs that offer the lowest expense ratios in the world: As low as 0.08 percent for U.S. broad market exposure. The new Schwab Total Market ETF (NYSEArca: SCHB) and Schwab Large Cap Equity ETF (NYSEArca: SCHX) are now the lowest-cost mutual funds available to retail investors.

What’s more, Schwab is offering zero commissions for Schwab customers who buy or sell the ETFs.

That’s a big deal. Commissions are a huge hurdle