> Because they could do websites with only quality journalism but they dont have enough people subscribing to do so.

Chicken and egg? Virtually nobody has paying customers before they start and create their product. Especially for the large media conglomerates, I don't believe it would be a venture where they'd have to risk their company. For individual journalists or small groups that might be different. I don't know how successful the crowdfunded experiments of the last few years were.

I do believe that it's hard to transition from the current form to an alternative system by making lots of small changes over a long time. On the other hand: there's a chance to build trust with each new generation. It's much easier to start with a clean slate than win back those you've lost, I suppose.