@Northstar
Good point. We have seen Driveclub having 10 million users and the studio got closed. Meanwhile GTS has 8,2m users.
It's difficult to judge what will happen to studios or a franchise with sale or in this cases user numbers alone. You need revenue, cost, profit, expectations of the publisher, ... .
Which is strongly correlated to sales, unless your model is dominated by microtransactions and DLC.
Even looking at sales you are missing important information like budget, revenue, ... .
For example (even with same budget, marketing, ... and no microtransactions or dlc) :
Game A sold 5 million units
Game B sold 5 million units
Same performance right? No, because we don't know the price the game were sold for and what the revenue was. Nintendo games for example rarely drop in price. Thus their game selling 5 million means higher revenue in most cases than an Sony, MS or Third Party game selling 5 million.
Don't get me wrong, it's somewhat fine to look at sale numbers to get an better understanding how an product is doing. After all it's better than no data at all...
However, using sale numbers to ultimately decide and judge the performance is an bad idea and literally everyone studying business administration knows better.