I hate to say this but I think the Vex Mythoclast is gonna stay at 323. The reason I say this is because of our newest exotic the necrochasm. It's beginnings as the eidolon ally only maxes it's attack value at 324 which (correct me if I'm wrong) is the only post DLC legendary weapon with this attack value maxed out. I think the Necrochasm when upgraded will, like the Vex Mythoclast, have a higher attack value for is time but ultimately fade like the Vex Mythoclast. It would be surprising to see bungie buff the Mythoclast again to 331 or higher.
I love my Vex Mythoclast and I'm not trying to hate on it. I'm just speaking my opinion on how I think the weapon will fair.
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This also promotes a new more powerful exotic (necrochasm) while having others at less but same attack values