Logging in requires a data capture, this data is often used for marketing or for pay walls. Targeted marketing is something that the BBC shouldn't be budgeting for. The BBC doesn't produce enough 'rated' content to be able to build this system for parental controls (there is an existing cookie-based system for parental restriction).
The BBC is widely regarded for its excellence in broadcasting and forms part of the British identity. Making any changes starts to alter that reputation in the world.
The BBC iPlayer would be an extremely stupid thing to put on a subscription model. In January 2014, there were
315,000,000 requests for content so it is clearly very popular. The only way that people would accept this would be if BBC iPlayer offered past seasons. This would require both more datacentres for the amount of data processed and probably a lot more cash needed to pay for rights to host it online.
As for BBC channels moving to a subscription model. Channels fulfill most of their remits. BBC One and Two are very popular and watched by all spectrums of the population. BBC Three could rack up a lot more viewership if the content was more original than repeated, for instance it'll tend to run all programming twice before the station shuts down in time for the CBBC channel to start broadcasting.
Part of me thinks that BBC Three and Four could be put into the private BBC company (this exists already) to join the global BBC News service (this may be BBC World Service?, anyway it already has ads if viewing from abroad) and be self-sufficient- Channel 4 is a Public Service Broadcaster publicly owned but running self-sufficiently. I wouldn't be opposed to advertising on those channels. If Cbeebies and CBBC were privatised then there'd be an urgency to keep them ad free which would mean that they would have to run at a loss. Perhaps Cbeebies and CBBC could be behind a TV pay wall?
The Welsh and Scottish governments should have to pay for the running of BBC Alba & Cymru. Up to them how they fund that.
If the TV Licence was easier to pay and cheaper then I think that more people would pay it. It's such a pain in the ass to deal with the TV Licencing people - I'd rather deal with SFE on a bad day! How much money is spent on pursuing student halls? I had a letter WAITING FOR ME despite not having moved in to tell me that I had a TV and needed to pay a licence. No, piss off. With Car Tax becoming easier to pay, the TV Licence should be too.
TV providers (Sky, Virgin etc) should be enforced legally to incorporate the TV licence into their fees to ensure that at least all those customers are paying.
I'd prefer options in this order:
*Simplified* TV licence
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Existing TV licence
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Part privatised with adverts on some services
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All content locked behind paywalls and subscriptions