is the engine gone be in development or discontinued
it is NOT beeing disontinued, why should it?
There are too many people who want to improve/bugfix it and also tons of users who do nice things things with it.
BGE development is at an all-time high. I wonder if you saw an old article from a few years ago, when people were talking about discontinuing it? In any case, things are going quite well for the BGE at this time, so not to worry.