I could be wrong but that's how I view it & see it panning out. 

I don't see ecash being particularly useful unless your ecash wallet can pay a lightning invoice. People shouldn't need to trust a token/mint just because you have. I really like Aqua wallet's approach in this regard. Custody & exchanging value while minimising 3rd party risk is what's being solved for in my mind.

One of the benefits of ecash is not needing to be always connected to the internet to exchange value. This has some niche use cases where Internet access is sporadic or unreliable.