Make an extension that would work like godatafeed.com
To have agreat success with eccommerce you need the ability to push your data out the all of the comparison shopping networks like Amazon, Ebay, Sears and CPC shopping networks like Goolge. The issue is that apparently if you have variations this is impossible (especially for Google Merchant) another issue is that all these networks require the data in different forms and requirements. If you go to GoDataFeed.com you will see all of what they do. Based on how expensive it is it would probably make for a very lucrative extension. Basically $299 to get setup on Amazon, Ebay, Google and Sears, plus $150 a month for each. That is for only 4 networks.
We are working on a service which will help you do this.
A GoDataFeed extension that produces a GDF feed would be awesome. It would allow that service to easily setup Amazon Product Ads, Google Merchant, etc. to WooCommerce. Would be a killer extension for our business.