Flight Sims are different and they really have a large base worldwide and it made sense to bring them back and also from what I have heard they are not costly to make. Video golf on the other hand is very costly and time consuming to produce. If there was a market for video golf others would jumping to get in not jumping off the ship as they all have or are doing. Microsoft is a business and selling a few hundred copies is very bad business.
You have things very, very wrong. The new flight sim currently has over 200 people working on it and they are still hiring. If you look at the complexity to make a quality flight sim, a golf sim does not compare. There is a huge amount involved.
People were jumping off flight sims. Forums were becoming dead. If you read flight sim forums over the last few years the only new threads were usually people who had a problem looking for a solution. This is dead.
Microsoft announce the new flight sim, suddenly the forums go crazy. There are many out there who would embrace a new golf sim. Times were bad for a while and golf sims vanished except one or two like this one and TGC.
These aren't fully featured golf sims or what a company like Microsoft could produce. It's a new gaming era now with many online capabilities at hand and distribution via things like Steam. If someone puts out the right golf sim, I think you would suddenly find people coming out of hibernation.
If the flight sim is a success, I really will not be surprised to read of a new Microsoft golf sim announcement. I would bet my house the idea has had a mention at Microsoft already.