So basically pluginplay.co seems to offer similar functionality that Rack Extensions do, but for VSTs. You manage - install, update, etc. - your plugins from single account, you can try them out for free (10h every month!), there's also subscriptions available. For now not many developers are on board (seems like it's just D16 and kHs on the website, but they mention "hundreds of plugins" in video), but if this catches up it could be a game changer - I hate the fact I need to remember all the websites, e-mails, logins & password for my plugins, which makes REs so much more convenient to use.
http://pluginplay.co/