I work in this industry and will say there's still life in broadcast TV yet although that is rapidly changing.
If you're purely talking about delivery method (Ariel or satellite dish VS internet) then yes this is a changing landscape and more services are looking to be delivered over the net. However one thing to remember is our infrastructure is not all that great compared to other countries and some areas can't get a decent enough broadband speed to receive high quality streaming so a broadcast signal is their only hope. By switching to internet delivery only you'd be losing a good 10-15% of possible audience.
If you mean streaming services VS linear scheduled TV then that's perhaps a slightly slower change than thought. Although everyone talks about Netflix etc. the Free TV model is still more profitable by miles. Advertising revenue has taken a hit with Covid and this may mean some smaller channels close or show less new content. We also have an ingrained nature in this country particularly of having access to 'free' TV (regardless of the BBC license issue) so not everyone wants to subscribe to Netflix, prime and the many others on the market, particularly with hard economic times ahead for many. Also from research conducted many may find the choice available great on SVOD (subscriber video on demand) services but overwhelming and making a choice of what to watch in an evening a chore so still turn to broadcast TV where someone has chosen for them. We're creatures of simple habits.
What I think you'll see is the rise of streaming services but many will be of the AVOD model, free to access and choose content but you still have to sit through some advertising to watch.
