People really still watch SD? Even my Granny has HD tv, and she not that well off.
Yes. Remember lots of HDTV sets sold in the 00s were HD but only had DVB-T tuners.
It's only relatively recently that Freeview have mandated DVB-T and h.264 compatibility for all Freeview branded TVs (i.e. made Freeview HD the standard for all TVs). Until quite recently it was perfectly possible to buy DVB-T-only displays that aren't compatible with HD. (As others have stated some of these TVs were HD Ready or Full HD and had HDTV DVB-T+h.264 tuner/decoders for the HDTV systems used in other European countries like France, Norway, Ireland etc.)
Similarly there are significant numbers of SD MPEG2 Sky Digiboxes (remember in some regions the DSO schemes were Freesat-from-Sky and beneficiaries in those regions got SD Sky boxes)
Of the 6 TVs I own - 2 are Freeview HD. 3 are HD displays with just Freeview SD tuners (one of them also has HD h.264 DVB-T but not DVB-T2 so is SD-only in the UK). One is an SD analogue only B&W CRT.