Re: Presidential vetoes are usually empty threats
He had only two vetoes because the Senate was democratic all six years. The republicans had very little power to pass bills through congress that Obama didn't like. Now that republicans control both houses the chances are raised, but democrats still have the ability to filibuster in the Senate.
A bill striking down net neutrality would need to attract 7 democrats to break the filibuster if all the republicans vote for the bill which is not a foregone conclusion - a handful who hail from more liberal states and face difficult elections in 2016 may side with their constituents on this one.