I'd be willing to bet there are more non-4k sets in people's houses than 4k and most people rely on wifi in their homes so I'd probably call BS on your "majority".
You don't think will look towards the future and think they buy based on what they're? Whew - that's short sited to buy for the
immediate situation. I stopped buying anything 1080 in early 2017 knowing it'd need to be replaced within the year :/
The price point made it an obvious winner.
True - what is the Roku saving? R100.00?
Personally, I'd rather pay the R100.00 and get UHD / HDR / HDMI 2.0 and know hardware wise, I'm pretty uptodate ...
EDIT : And when I say 'majority' , I know the rough sales figures of the Kwese 1080 box and the LIT ...