I think organ music is rather similar to the sky. In those seven hundred years (from the point when we have the first surviving manuscripts of organ music) composers created an unbelievable amount of pieces.
If the organist would want to sight-read at least once through every single surviving composition, probably it would take a few years to do it. But if you wanted to listen at least once through every YouTube organ video - you would need more than your full life's span for this purpose.
The beauty of it is that these videos can be seen by every person who is interested - you can listen to them and share, you can raise interesting questions about any of the pieces or videos, you can write blog posts about them.
There really are no limits for generous and curious minds (unless we create them, of course).