One has to see the Usenet for what it was and still it below the surface of binary groups. Textgroups are a wealth of information and on a large number of topics I've experienced advantages to other ways of discussion/support (like web forums, mailing lists) because the Usenet has always had the most competent crowd.
With that hanging over the Usenet, shutting it down will not be in the interest of any industry. What can be done is what ISP's already do for their customers as they mostly offer Usenet access but don't list binary groups. What's left is completely legal content of thousands of posts per month.
But even if some Usenet access providers would consent to limiting their access to text groups (the largest ones in terms of number of posted messages/day are after all the large binary providers like usenetserver, giganews, newshosting, tweaknews, eweka, astraweb etc), that still would not bring the binary groups down. There are currently over 6000 usenet servers (so says Wikipedia anyway) and a good Usenet access provider should have direct infeeds from at least 50-100 other servers. Affecting all of them is hardly possible as they're likely to be all over the world.