A comment about the masterclasses in general might be in order here...
I first found MLS because of the mogul masterclass, and I still refer people to it and the others whenever the subjects of kitbashing, scratchbuilding, or the toylike appearance of some large scale models are brought up. To me, the value of a masterclass is not in being part of a group of people building a given model, or of being able to purchase various parts as a bundle or at a discount. The greatest value is the fact that the information is there indefinitely so that, 5 years from now, when you're ready to start work, there it is, ready to go. The skills taught, the information given, the methods of work, all are valuable, even if you have no need for a Mason bogie, or a Mogul, or anything else that may be built.
I am currently working on a scratchbuilding project of my own, with techniques learned in reading and re-reading every old masterclass article I can find.
So no matter what the next subject may be, or how many people join in, there will be people like me who appreciate the work for years to come.