No extra sockets in 5.4? Then why the hell did you update the 5.2 weapons from ToT to be able to use them? This is incredibly stupid and seems like a total oversight. 1750g for a new weapon socket is SO not that expensive.
We updated the 5.2 weapons to allow the additional socket (but not the Sha-touched gems) because a very large number of players were getting their extra sockets just in time for the patch to drop (and thus, would only be able to use their reward for a week or two). That's not the case with 5.4. The 5.2 legendary meta gem will continue to function, and the 5.3 epic cloak will upgrade into the 5.4 legendary.
We feel that, at this point, the Sha-Touched gem and socket have had plenty of time to be useful and it's time for them to go. As Lothrik mentioned, we'll be balancing content assuming that they're not present anyway. That said, nothing on the PTR is final, and we are still open to discussion on the topic.