Reintroducing Ranged Survival as a fourth spec can ONLY be profitable. Everything that melee SV had going for it in Legion, ranged SV has more. Reintroducing ranged SV would result in more profits than melee SV did, for a multitude of reasons. These reasons are as follows:
Ranged Survival already has fans and a playerbase attached to it. Melee SV did not. Therefore ranged Survival would attract just as many, if not more, players to the game, including returning players. This would in turn mean more income for Blizzard
Ranged Survival already has a fantasy, talents and abilities. Melee SV did not. Therefore Blizzard would be required to spend less time designing abilities and talents for ranged Survival (whereas they had to design new abilities and talents for melee SV), therefore it would cost less money than melee SV did.
Blizzard has years of experience balancing and tuning ranged SV. They did not have any experience balancing and tuning melee SV. Therefore Blizzard would be required to spend less time tuning ranged SV, therefore it would cost less money than melee SV did.
Bringing ranged SV back as a fourth spec wouldn’t require deleting melee SV, whereas melee SV caused ranged SV to be deleted. Therefore less players would be alienated, and the Hunter class and WoW in general would retain a higher number of players. Therefore more players would be playing, and Blizzard would have more income.
Since it has been shown that ranged SV would bring in more income than melee SV on average, and would cost less money than melee SV on average, it can be said that the profitability of introducing ranged SV is necessarily greater than melee SV.
Therefore, the only possible way for it to be not profitable to reintroduce ranged SV as a fourth spec, would be if the introduction of melee SV in Legion was not profitable.
In that case, we are left with two insights:
A. Removing ranged SV in Legion and replacing it with melee SV was not profitable. Therefore Blizzard should not have done it.
or
B. Reintroducing ranged SV as a fourth spec would be profitable. Therefore Blizzard should do it.
One of these must be true.