As far as I know is there is no way to just delete asset that you own (or even to close it if you are the creator). My question is then, is there an address we can send all our useless audodiv assets to so I don;t have to look at it anymore?
You can 'burn' your assets by transferring them to the NXT Genesis Account (NXT-MRCC-2YLS-8M54-3CMAJ).
However I would not bother being hasty about it. I would be very surprised if trading ceased altogether. Although dividends and revenues and a 'backstory' are nice many assets on the NXT exchange are traded often with none of this. In fact I would go out on a limb and say that 99% of assets have never reported any revenues and only a few have paid dividends.
The decision is yours but I think it is likely people will keep trading.