Isn't this in the process of being changed from a TV Licence to a Broadcast Licence so everyone will have to pay it?
It already is effectively, it's required if you watch any TV content live as it's broadcast regardless of if it's viewed via a TV type receiver (cable, satellite, or terrestrial), or over the internet on your PC or tablt.
I think the suggestion is that they remove the loopholes for the likes of catch up TV that let you watch content that was broadcast an hour or two later.
Other suggestions I've seen (and in use in other countries) include things like making it a requirement to get a licence if you own a TV, apply it per household regardless, add it to telecoms bills etc, require the likes of Sky and VM to pass on details of their TV customers (hard to argue that you don't watch live TV if you've got a Sky TV sub).
At the moment the UK is amongst the more lenient in terms of having a TVL or equivalent and how it's collected, as the law currently allows you to basically opt out based on your word, and not via a legal document (which I believe is in use in at least one European country*), and because the law does allow you to opt out easily it actually costs more to enforce than some of the other methods.
*And if you lie on it, you're not just watching TV without the licence, but basically committed perjury or similar.