Ultimately there are only three factors really worth weighing here:
- Will SAM fall short of the necessary level of entertaining play unless Shoha is replaced?
- Will SAM fall short of the necessary level of power unless Shoha is replaced?
- Does Shoha's current implementation just have such obvious improvements that it would bug the hell out of the average player if those opportunities weren't taken up?
I see no reason to believe that any of those are the case. It looks like a small Meditate bonus and seems like it will perform well as such. I'd even guess that Shoha would be just as interesting in its more limited possible form (e.g. if stacks would not survive movement, forcing you to accurately set up where the boss will land rather than... anywhere).
I'm also personally glad that I don't have to wait until level 80 to get something so integral to my kit as, say, the impact that was 70 DRK's The Blackest Night (to the cost of the coherency and satisfaction of its job gauge from 62-69).
I'd welcome improvements to an extent, but I don't think they're anywhere near necessary either.