I doubt we'll see it open sourced, or saved in any form by Yahoo. It's too much cost/effort for them, when that's the reason they're scrapping it in the first place. What i'd like to see is people quickly rolling out tools that help us get our Delicious bookmarks into other sites easier. Eg into Google Bookmarks. That currently requires you to install the Google Toolbar and import them through that (ugh).
You want a tool to do this job so you can avoid installing google toolbar? How much do you reckon thats worth to you?
A system that actually gets all the data from delicious into google bookmarks seems to be worth while.