Not necessarily. If I were appointed Worlds Registration Czar---not yet offered to me, but there's always hope---it would be a tiered registration, but not based on ratings. For the very reason you describe. Probably a combination of points (with a cap on huge events), NT standings, prior Worlds finishes, and ratings.
It should be possible to have the best players competing for a World Championship, and a huge field of people there for the experience. It doesn't have to be a choice between the two.
I agree with those who say that this year's pros had a 10-hour window to register, so all had reasonable opportunity to register. But that 10 hours wasn't set by the PDGA---it just happened that way. What if next year's registration, under the same rules, takes 20 minutes? Being available in the middle of the night, with an internet connection, and quick on the keyboard, is a poor standard for determining who should play---poor for the top pros, poor for your local 950-rated pro. Why not base entry to the disc golf world championships based on.....disc golf?
Well, that's my stump speech. Now to see if my Czar appointment is forthcoming.
(Actually, I hope its not. Like everyone else, I don't want to do the actual work. I wonder if the PDGA has a position for trusted backroom advisor?)