[Technologist]

How many linear channels will there be .... 16 ?
In the UK - lets say for PSB - a bit of a trim to the BBC but say under a dozen PSB TV
TV COBA channels i imagine that there will be an odd barker channel
for the BBC who cannot use PSB airwaves for UTKV Play , and WB/Discovery for D+
and may be Sky (News) ? as the Other PSB use PSB to promote "X" "all" and "my"

So if there were only 16 linear slots available on ANY platform for regular Linear
I don't think anyone would be too put out. (may be two dozen??)

Radio is very different! - i just don't want to go there!!!!

The other use of Linear TV is live Sports (and Events).
thus Sky may have its platform and Discovery/WB its own !
And the BBC may augment what it is doing on RB
(it may be worth considering why no other PSB has got RB or side-channels)

So we are looking at 4 platforms for Legacy PSB (assume BBC Carries National broadcasters)
one for UKTV, and then the Sports and Events Broadcaster have one each
But will the Rights holder have their own platforms???
- and this may include the Arts Council or Royal Opera or Glastonbury or Glasgow Fringe!

So how is Channel /Stream Discovery to work????
and how (if at all) do PSB get prominence?

The Broadcasters have a great emphasis on Open International Due process standards
particularly for PSB or for Broadcasters (capital B) who have public safety roles.
as this provide a level of interoperatiblity and stability with FRND IPR.
Failing that development of open specifications (which are likely to by consensus not due process)

The tech companies tend to like their own propriatry ways of doing things....
and seek tie in and upgrades ! ...... and often large fees on non FRND basis.

Lets look at how the BBC have addressed this
Firstly there is/was TAL - and this seems to have been adopted by many broadcast streamers
bbc.github.io 

It has supported hbbtv TS 102 796 and getting Freexxx Play ....(why is this with Platform not Spec body
www.etsi.org 

It developed Iplayer all be in on TAL but propriatory application all be it using more generally accepted specifications than it used to (as the web has caught up with video)

Have Policy on the distribution of its services according the the public interest
which means that they cannot freely distribute on hbbtv. (as hbbtv like broadcasting know nothing of the viewer)
downloads.bbc.co.uk 

........ and was involved in You view which has not been a success!