I actually have a noname CRT (Lumatron or something haha) that we bought new in like 2007 for real cheap that does not support NTSC! It takes PAL 60 just fine, but I plugged in my NTSC NES into it once and it was only in black & white. Perhaps it's because it was through composite cables, but my other TVs can display it in color no problem. I haven't tried NTSC through RGB Scart though, maybe that would work. But the NES doesn't have RGB. My Trinitron CRT just takes that NTSC signal through composite like it's nothing and displays it just fine.
Anyway, so there are TVs out there still that doesn't handle NTSC as well as they should. But in this day and age I think the vast, vast majority of people have a TV that handles NTSC signals just fine. And actually, in the VC case, they wouldn't even have to display an NTSC signal, they could just display the game using PAL 60, could they not? PAL 60 seems to be pretty much identical to NTSC. Same framerate, same resolution. I suppose the color standards are different, but whatever, that can be fixed in software. So why not use PAL 60?