Yeah, I got it. What I don't get is why it matters or more specifically, why you think it makes a difference. They're still just dick and fart jokes. One simply requires a pinch more effort to pull off.
There's barely even a joke with Stream. You would have to say pee stream for there to even be a punchline. Otherwise, you're just explaining the joke and it's not one at that point. And since that's the case, you can just do that with anything. You can add a modifier to any word to turn it into something else. You say Stream to people and they'll most likely think of music first. In fact, that might be the most problematic thing about naming a console "Stream." It'd sound like Nintendo is trying to make an iTunes-killer.
In any case, people got over Wii pretty quickly. It still sounds silly but it's there. It's a part of pop culture and vernacular. No one even really thinks about it unless it's brought up on a message board and even then, it's between people who accept that exists and people who are still railing against it even after 5 years.