If you've got an idea - _and_ a plan _and_ a working implementation of that plan, you'll get taken much more seriously that the people who're trying to come up with ideas on the spot (even though occasionally their ideas might genuinely be better than yours).
Aka "rough consensus and running code" - as used by David Clark and the IETF: http://www.ietf.org/tao.html#anchor3
If you've got an idea - _and_ a plan _and_ a working implementation of that plan, you'll get taken much more seriously that the people who're trying to come up with ideas on the spot (even though occasionally their ideas might genuinely be better than yours).