Can current techniques be scaled/improved/optimized to do this or do we need new techniques?

It took 30 years in the generative art world to move from cave paintings to the level that we have today because we needed new techniques.

For podcasts we are at the cave paintings level.

If we can get to professional level quality podcasts with the current techniques then we might only be a few years away.

I think it is more likely we will need new techniques which puts us potentially decades away.

If we look at LLMs the improvements over the last 18+ months since gpt4 was released have been minor despite incredible levels of investment.