DSL is reaching its potential. With the hard limit of 50MB each additional improvement or feature enhancement grows harder to accomplish. Truth is the canvas will never be fully painted, but each new stroke is harder to place.
If DSL were a car I sort of see it like the old Porshe 911. I say that not because of it's speed, or power to weight ratio, but because of how the 911 evolved. For decades, the 911 kept to it's original design and made diligent improvements.