I think a return to this format is in order, otherwise without more recasting and/or finally getting access to Season D, we're stuck in Season C, and a Season C minus Servalan (though that can be worked around much easier than an actual crew member).
And it's too soon to recast Blake, let alone Servalan!
Yes yes yes!!!
Blake could maybe be recast in a few years' time, but Servalan is unrecastable