I agree with OP on the bottleneck problem, since I had the exact same problems with all the good light farming spots being taken. Once had a party in Pagos, went out and reformed through PF to get into a new and fresh Pagos instance, but as soon as we got in, the very same spot was already taken by another group...

But don't you think reducing the crystal requirement would make getting the relic a little too easy ? I would lower the value of the item, its "exclusivity". This kind of nerf is more welcome when the expansion is nearing its end, like the previous relic nerfs. It would anger quite a few people who farmed a lot to get those before everyone.

But it would be indeed the faster way to solve this problem.
Or may be add more dragons...