[Stooky Bill]

Not quite. If you use Freeview, you are more likely to see/use the SD channels since they appear first in the TV guide (Freeview Play / CLM excepted) even if you have an HD TV. You may also be using an older TV that can accept HD but is not DVB-T2 capable, which is presumably why there's no real appetite to switch despite the obvious efficiency gains.

Yesterday was a much more niche event because you would have needed to still use a Sky SD box (which have all either died from old age or are so unusably slow, it would be surprising if anyone still did) or one of the handful of Freesat SD boxes that quickly disappeared from sale.

Not that I am suggesting some big Northern Ireland style send-off here!

Transitions from DVB-S to DVB-S2 and DVB-T to DVB-T2 are both really the same thing, the audience don't really understand or care about the difference.

The big difference between the two platforms is the number of receivers. Satellite has an upgrade path - Sky have encouraged their subscribers to upgrade and of course they normally don't own the boxes. DTT is different, there's a lot of early receivers knocking around, particularly ones integrated into tellies... that's something that never caught on with satellite.

When it finally comes it'll be more of a challenge to switch over but there will be just as little of a fuss when the switch off happens - it's a technical change rather than something actually closing.

See also DAB to DAB+