Yes for following reasons.
1. Not everyone/ friends have DDR.
2. Danceing alone is boring.
3. Gives players some compition anyway they pick there region, and level preference.
4. Bring a whole new experience to dance battles.
5. 2people per. house could verse another DDR team anywhere across the globe.
6. lastly, with mics talk while you dance but appropreatly because the parents might be near the kids playing.
These are why I think DDR should have wi-fi multiplayer mode.
Listening to Hatsune Miku 3pm-8pm. I'll be on at 8pm-10pm every day.