Sounds arrogant or ignorant to me. You've got your solution so well figured out that you can't bother to talk to people about it and gauge their reaction? Sounds like a path to failure.
I have other friends who are also working at "stealth" startups who don't want to tip their hands specifically because they're backed by relatively famous people in the space. If they start talking they're going to get a lot of unnecessary and unmerited attention just because of _who_ they are and not _what_ they're going to build.