Not sure what their bread and butter watches are in this line BUT...
If I were to equate forum popularity with sales (and that is dangerously stupid, i know, but humor me), I'd say the Master Control model isn't quite as "popular" for an entry level JLC vis-a-vis a PAM0 or a Rolex Sub or DJ.
While it may not be as iconic compared to those "entry level" watches, I think there's a lot of wiggle room to grow this humble model into something really spectacular. Of course, I have no clue if this particular model contributes greatly to sales but it personally doesn't come off as a popular watch.
When it really is for people like me
I think there is a big market for it.
Let's see, how to make it nicer than it already is:
1) antimagnetic case
2) they need to do something about the dial... it is not very photogenic. compare it to the simpler MUT and i wonder why the MC cannot look as gorgeous as the MUT in terms of simplicity. Maybe too much "open" space in the dial? I don't know. I have seen one, of course. And I would probably go first for the Datejust before even going to the MC.
3) and, please, please, please... can we just go back or at least have the READY option of having a tang buckle strap??? these deployant thingies aren't working for me. the double deployant in my reverso irritates the hell out of me.
They say it's tougher to design a volume seller like a Toyota Corolla than it is a Ferrari because of market constraints.
If they can do something about the MC, make it into a Datejust like staple... wow!
Oh, yeah, I also like the Geophysic very much. A re-edition or tribute would be something to look forward to as well.