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Hi,
Keep them. If you consider that the translated webpages are duplicate(template not translated or/and content auto-translated) add a canonical to the english version. I wouldn't rely always on IP location or browser language to redirect the users to their language version so add them a way to choose the language. You can go even further and host the subdomains on different IP's geolocated to their country versions and add those versions in the sitemap too.You can find a guide about the multi-languages sitemap on the google webmasters tools support website.
Anyway, as longs as you have a good bounce rate and design your website for users and not for search engines you should be fine.
As I work under a nda, I can't send you one of my websites but I can give you youporn.com as an example. Check the page source.
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