You know, rocket science is hard. Spaceship 1 had a landing gear failure, and White Knight one had wheel depart the aircraft due to shimmy. SpaceX's first two launches failed, and their last launch had a major anomaly when the second stage failed to properly relight. The DC-X had a much more spectacular landing gear failure, yet is considered one of the most successful rocket programs of all time.
This gear failure is embarrassing, but not anything like a show stopper.
Disclaimer: I worked briefly for SNC about 15 years ago, but had nothing to do with landing gear design.
Seriously, SNC has some real innovators at all levels of the company, they are a national asset.