There are a variety of reasons why it's probably not a good idea to have robots moving around at high speed indoors.
- There's likely to be more wear on the carpet, and "tracks" will become conspicuous.
- There's a tripping hazard. One second there is no robot and the next there is.
- If anything goes wrong and the robot hits something, it could cause non-trivial damage - possibly including generating fire hazards.
- Last but not least, more speed usually means more noise. Noise level is something often forgotten, but for robots operating indoors I think it will be a factor. People already fuss over noisy PC cooling fans.
For most domestic or office space service robots probably a very pedestrian Turtlebot-like speed of 0.3m/s will be about as fast as it gets, and may even be slower if handling objects.