I think the "doubters" are just not used to seeing that sort of thing. They probably think the approach is going to look more like this:

http://topics.nytimes.com/top/reference/timestopics/organiza...

You know, the case where you hire a team of contractors to build something, and then that team totally screws up, goes years past the deadline, and charges you enormous amounts of money. Meanwhile, there are ready-to-ship products out there that can be bought for a yearly fee, which carry less risk but higher costs.