From a business point of view, it may be good or bad. I wouldn't like to guess.
On the one hand, they might sell more copies. Without a free PDF cannibalizing sales, it will be much easier to convince people to buy something. On the other hand, it will decrease their circulation, which will devalue their ads and job listings.
I always looked forward to the beautifully laid out PDF version.
Before the charge for pdf version there were a large amount of downloads which bearswithclaws used to appeal to advertisers now he doesn't even release numbers openly on the site so I would assume it went down quite a bit.
Edit: it also gets less traction on hacker news, and comments are far more negative, where before it was praise and discussing the content and quality.