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On a serious level, FCA is just badge engineering a load of common developed cars to juggle sales to try and build up to two brands and when the new Alfa Coupe is released soon it will look more and more like Alfa has the whip hand.
PS Remember that when VW killed the Portuguese built Scirocco they replaced it with the T-Roc. The world has changed and the sort of cars that Maserati made of old are now no longer desirable to the extent that they were.
Alfa is always going to sell more cars than Maserati as they are priced cheaper, even for the QVs Giulia and Stelvio. They need more of a buzz with the general public to sell them than Maserati do because they are aiming to be a volume brand to challenge BMW, Audi, Mercedes, Jaguar (I never thought I'd say that) etc. This isn't the market for Maserati and they don't need to push as hard to meet the numbers they are looking to sell. The brand, for the moment, sells itself.
Maserati know that they need a signature sports car to keep the brand alive. The recent revision of the GT to prolong sales for another year is witness to that, so I don't see them just quietly dropping out of that market. You're right though, its not going to be the bulk of the sales. I'm expecting the GT replacement to be announced on 1st June, along with the Alfa 6C. They will share some common components and will both be built in Modena. The Alfa car will get more shouting about it and will be more hardcore than the Maserati, which will be pitched as a luxury sports car.
In the meantime Alfa will sneak out a larger SUV and the Giulia coupe, and Maserati will have a baby Levante based on the Stelvio platform. Unfortunately those SUVs are selling.
The only hope really is that we start to see some drive train development with the V8 in the Maserati GT replacement as well as a V6 based mild hybrid with an electric motor on the front axle. I'd love to see V8 + electric too but I can't see them doing that to start with at least.
Disclaimer: We are in the market for an SUV come the winter, got stuck in on more than one occasion last winter. A Stelvio sized Maserati would be very tempting.