Idea filter

I think that after a while this will get pretty crowded and crap or spam ideas will become popular. To solve this, I think you could add a feature that, after a set amount of time, with not being upvoted your post gets deleted.      If you don’t like that, you could say that after a year of being posted, a 7 day timer begins and if it doesn’t get upvoted in that time, it is deleted or moved to trash for 30 days where the owner can revive it.      This could help with 

1. Removing spam ideas
2. Help put better ideas higher up.
3. Trash ideas

Hope you like it! Also, make a specific section that I can post this into :)