I've always assumed that it must be literally
e.g. MPs/politicians/political activists/party members/tedious bores (etc) that have
of these kind of political programmes*.
Whether that be On The Record, Frost on Sunday/Breakfast with Frost, Despatch Box, Sunday AM/The Andrew Marr Show, Westminster Live, AM:PM, Holyrood Live, Hearts & Minds, Scrutiny, the old BBC Two regional ones like Midlands@Westminster/Viewpoint Midlands etc, This Week, The Politics Show, Daily/Sunday Politics... blah blah blah.
(*Plus also some of us TV pres geeks, but watching for our own reasons obviously. And even we seldom watch methinks, and probably only small chunks of the programme (e.g. around the 11:37-ish regional opt junction in Sunday Politics)).
99.9% of normal humans must barely be aware of the very existence of these programmes, let alone be inclined to tune in to them.
That said, I absolutely didn't see this announcement coming.
I can't imagine what the heck they could put into the vacated airtime, as Sunday morning/lunchtime political snoozefest has been a fixture on BBC One and/or BBC Two since Moses' Bar Mitzvah.
I could charm the vultures off a corpse.