First to say, in PAL world, everything seems to be fine.
But it isn't. I tried a lot of Blu-Ray Players and none of them was able to switch to 50p/i on playback.
(most of them do, but only at correct AVCHD structure)
So, why not trust in 720p/60 and 1080i/oops what?
Taking 24p to an 30i...