I was at a sports industry conference a couple of weeks ago (to see what could be picked up / applied for news). One of the panels was a ‘state of the industry’ discussion with executives from BT Sport, DAZN and Eurosport. Streaming at 50p was mentioned by the COO of BT Sport (and I think the VP of broadcast and tech for DAZN) as one of the improvements that could be made that immediately delivered a benefit to all customers. So Eurosport and Britbox need to sort that out!
I somehow managed to miss that event, despite the subject matter and location.
The vast majority of sports content in Europe is still distributed as 1080i25, but for native UHD productions, 1080p50 is pretty trivial (and I think might already be happening)
To be honest - most 1080p50 sports streaming is using 1080i25 sources. Deinterlacing to 1080p50 rather than 1080p25 is a hugely better route to go down for sport, as you retain the 50Hz image rate and full temporal resolution.
1080p50 is entirely possible in many OB trucks (either those designed for 2160p50, or the last generation of HD trucks - though the former are probably a better choice) However as most international rights feeds are either 1080i25 or 2160p50 those are the likely source formats.
I know some eSports events are shot at 1080p50 or 1080p59.94 for live streaming - to avoid the judder of p25 or p29.97 - so it is happening.
Let's face it - the sooner we get rid of interlace and move to full frame rate progressive the better...