Something like this will be a problem for low populated servers.
Instead of killing it quickly - nobody will bother with them. Pale Rider S hunt in Heavensward required quite a big number of people.
It will also be a problem for early morning/morning times/people.

TL;DR I've been hunting A/S hunts since HW and i don't think this is a good idea.
p.s. But as of right now, if you see an S hunt announcement, you better grab your pants and run fast to it. Also, join like 6 Hunt linkshells, it helps.