Marks MIGHT come withing 2/5k when 5.2 hits when people are still playing with 4pc t14 and the AiS cast reduction vs people without the 4pc. As it sits that half assed change is not going to be enough to make people play it, not when SV is set to beat both BM and MM in all aspects. Just look at the new stuff in 5.2, legendary meta that does nature damage (boosted by SV mastery) 2pc tier that needs 40% mastery from BM to equal the damage it does at SV based on the PPM difference, and a 4pc that is boosted by SV mastery.
Now i dislike SV as a spec because of its RNG playstyle, but its set to have about a 5% lead on BM with the 4pv tier and the meta. Unless they do something with scaling BM is going bye bye as soon at the t14 4pc is busted.