It should be exclusively for online gaming only at the very least. Microsoft in the early days demanded customers to subscribe to Xbox LIVE Gold in order to use the browser, Netflix, YouTube but later on since they changed their minds and made these services free. Sony followed their example but with the exception of, if you play a Free to Play game which has online then it's free to play online and this is definitely a nice bonus!
Nintendo's online paid service looks like it might just be a total disaster but let's wait and see.