I may be wrong, but in the future I believe that MB will be leaning more to $$$ when deciding on a writer to design a pen after. What sells these pens and who do they sell to. Not what writer deserves the honor more.
Their considerations are most likely to be:
Who buys our writers series pens? Americans, French, Germans, etc. Therefore the writer needs to match the buyer. If Americans purchase most of these, then I would think that writers who are well known to Americans will be chosen most often.
What is the level of recognition of the subject? The more well known, the more interest in the pen. This means well known to the common reader, not just the well read connoisseur of literature.
The reason I believe this is it is my understanding that Cervantes, Woof, and the Faulkner (among others) have not sold well. MB needs to put more thought into the era of the writer going back to the pen designs of that era and bringing those into the design. For example, the Hemingway was excellent in design as well as the Agatha. The Proust and Wilde were also desirable designs in my eye as the pen designs actually seem to fit the era of the writers. The Woolf was out of era and just too plain to interest my aesthetic appreciations. Woolf deserved a more colorful work instead of something black and rather undefined in appearance outside of its feminine shape. A good example of a well thought out pen, though not a writers series, was the Greta! Great pen in my estimation.
If they can't give a pen design to the era of the writer, then best to leave out the writer. It would be hard for MB to design a practical, refillable quill with a pocket clip. Cervantes was born in the early 16th century and I am quite sure that he didn't use a anything but a quill to pen his novels. When I first saw the MB Cervantes pen it reminded me of bamboo. Its design made no sense. I even read MBs official version defining their chosen Cervantes design. It still made no sense. My wife ordered me one for my birthday and I took it back to the shop and traded it for something not Montblanc.
The kind of things I would like see and would purchase would be something like an eye dropper for Dickinson or a lever filler for Twain, even though Twain will probably never be created by MB as Conklin has taken him on and is a popular crescent pen for them. However if MB did come out with an era pen for Twain, I would most certainly purchase it!
Montblanc has become simply weak in many of their important designs of late.
Just my 2 cents.