Earlier quoted context omitted.
1) Since there are a multitude of codecs, profiles, and containers to encode and deliver videos in, yes. 2) That is all your opinion with no facts to back it up. It is extremely unlikely that Metro is going anywhere at this point.
If a non-profit can keep on top of all the different codecs, profiles and containers, why can't Microsoft? By all means leave the bleeding edge professional codecs to third party software, but most people only use VLC to play rudimentary formats (MPEG-2, MPEG-4, WMV, FLV, etc.) This functionality really ought to be built into the OS these days.
Because Microsoft would actually be required to license every one of them that are possible to license legally.
The capability is certainly there, but the users will likely not pay for their availability. It'll be interesting to see how many users of Windows 8 do upgrade, in the case of DVD playback and the Media Center features.