I currently have one proposal that is really of great interest to me. But I have another idea or two that (as of the writing of this anyway), don't exist. And I really don't care if they take off or not - I would like them to, but if they die at any point in the process, no big deal. Even if they go to beta, I personally might or might not be involved (it depends on how busy I am if/when they go beta).
Would proposing them be in line with/against what Area 51 and the Stack Exchange idea is?