Yeah, like you say, this is silly, its up to the use to decide how to organize all thier media. You can do that now. You can change a button to say My TV, and it will link to your tv shares. I personally have it set up totally different than you, each epsiode goes into the folder for that show, each season has its own folder in the main folder...so when I want to watch TV, go to my video samba share, go to my TV show shares, find the show I want, then the season, then the epsiode. I personally wouldnt want a now playing section, it would be cluttered. Deleting, editing, moving, copying, etc is essentially file management, hence the best place for it is My Files. Now I wouldnt mind it if each section, videos, music, pics, etc, had the ability to edit samba shares instead of having to go my files would be nice, but dont want it limited to just a My TV section.
I guess my main question is, you say a MyTV section would make way for new TV centric features, what kinda features do you want/forsee/envisage? Any features that would be worth its salt would be integrated into a PVR, i.e. can control the Tivo, MythTV box, ReplayTV, etc. so not only would the devs of XBMC need to get it to work with one platform, but now theres numerous more platforms that will need developement and updating whenever any of those devices change format (I know personally on MythTV, whenever theres a myth database protocol change, any UI on XBMC needs to be updated as well, how many others do? Im not sure).