Technological progress does not stand still, even so far in the future.
Imho every update should have some minor (at least cosmetic) changes to the existing models, vanila and not.
In a place where same designs were recycled over and over (Valkyrie precedessors in Sigma 13, now Wraiths), it does not make any sense. Not only that, I like how those vanilia models look like as they are.