It sounds like a good idea, but pardon the pun, but it is 99.99999999% NOT to fly, and for several reasons:
1. You'll NEVER reach a consensus on what type of plane to restore.
2. Probably 75% of the users here are under 18, which means that not only could they NOT afford to chip in financially, but probably wouldn't even be able to participate in the restoration process.
3. WHERE would you restore it? Again, this is a global site, and even if you could garner a handful of people to support it, you'll be limited by geographical constraints. NOBODY is going to fly from Amsterdam to Victorville to steam clean seats on a derelict airliner once, much less on a regular basis.
4. Most of us have lives outside this forum, and getting people to SAY that they will do it versus people that actually WILL put in the time and effort will be difficult, if not impossible.