>Currently it is only still in the URL for SEO/backwards compatibility reasons //
Can't imagine ebay having any problem moving to new URLs nor getting any significant boost in referrals from such actions. What other backwards compatibility is at issue, scraping apps?
Panda absolutely wrecked eBay's organic SR multiple times. Getting this 100% right 100% of the time is critical to eBay. I was on staff (but not working on this) when Panda 4 happened to them: https://www.wordstream.com/blog/ws/2014/05/21/panda-4
Can't imagine ebay having any problem moving to new URLs nor getting any significant boost in referrals from such actions. What other backwards compatibility is at issue, scraping apps?