Different devices on a hotel guest wifi network are not supposed to see each other (and a hotel room wifi login on a ChromeCast dongle seems difficult - to say the least).
ChromeCast in a hotel would be my critical application. Plug it into the Hotel TV, tie it my tablet to it and play local movies or HBO Go.
The best way to solve that would be a direct connection between the dongle and the tablet, not going through the router.
Unless this is fixed by now, I have need to hold out as I have other (better?) means of playing various sources of video at home.
Maybe a third party solution would fix this, however, will it be supported by the third parties like HBO?