You do realise that an unfunded BBC will be a smaller BBC - if you want to replace anything you have lost it will not be free. The net result it will be pay more get less. Old people won't face a theoretical fine or imprisonment but will face their dotage with very little audio or visual entertainment unless they can afford to pay through the nose for it - everyone will get less access to news coverage too - wonder why that would suit a government?
And tell you what if the BBC becomes subscription only then they will apply that to radio too. When that happens other entities like Global will think " well hey we aren't putting out for free " and introduce a subscription too.
iPlayer, All4 any currently free to access catchup TV service will be too.......all will be fine it will be just what few services do you want for £20 per month