I don't think in our country in 2020 SD channels will shut down.
But, yes HD channels will be increase and costing for watching television is too costly incoming days, after increase a single HD channel all DTH operator will burn the RATE in their pack. only in this time when &TV HD as well SD introduce no price is change, coz already Rs.10 added in all Dishtv, and d2h....etc.
The logic is :_ when technology introduce HD/3D/UHD, do not effect our daily burn rate.