Television versus Youtube or online TV

I choose online video and often youtube 90% of the time, apart from the BBC’s more mentally stimulating output why ?

(1) The sheer quantity of adverts in broadcast tv has become largely insufferable, there is allot less adverts online than on broadcast television
(2) The nature of digital online TV being on demand rather than push tv, is a much stronger draw i watch it when I want it
(3) Choosing what I want to watch and when means Beneficially Im not strapped to the schlock that happens to be on at nearly all times and vast array of trashy broadcast channels.

how these facts alone dont spell the doom of broadcast television I’ve no Idea.