Funny thing: I always bought the bandwidth issue because it is so often posted as fact. Then I shot some stuff in 1080p60fps and rendered it native (at 60fps) and a 30fps version for
TV3. The actual difference in file sizes tends to be < 10% for most of what I shoot (which is a lot of fast-moving sports).
For example, a couple of hours of basketball at 1080p30fps yields a 9.13GB file. Same file at 1080p60fps is 9.82GB. This is consistent across many shoots (again mostly fast-moving sports).
Bandwidth is about fitting the file through an always-constrained pipe: does the pipe have enough bandwidth for smoothly transferring the file? I now believe that if the pipe has enough for 30fps, it has enough for 60fps. Yes, per the above, there is a price to pay for the extra 30fps BUT it's not a very big price for the added fluidity that comes with that video. If a pipe has enough bandwidth to stream H.264 1080p30fps, it likely has enough to stream 1080p60fps. The difference in file sizes is not nearly what people imagine.