For the overwhelming majority of day-to-day, line-of-business software, the nerds are a commodity and the project succeeds or fails on how good or bad the business folks are. They should get the blame for the failures but also the credit for the successes.

For the stuff that is genuinely pushing the technical envelope, it's possible for the nerds to make the difference. In those cases you do see the projects fail for technical reasons like "the code couldn't scale to the required number of users" or "the technical functionality never worked reliably", and those kind of failures are the nerds' fault. But that's the minority of failures IME.