Full marks for optimism.
DAB sound quality is knocked sideways by the latest iPlayer radio streams. They demonstrate what the digital dividend ought to be delivering - high quality programming and sound.
On DAB, the mess of nondescript commercial pop channels using an ancient codec at barrel-scraping bit rates = low quality programming and dismal sound quality.
To pretend that the commercial sector is going to start putting out high quality programming with great sound quality necessary to grab the audience away from cozy ol' FM, particularly when their major source of revenue is migrating to the web, is risible.