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I am concerned about this incredible slow-down to GameStudio development

Dagobert. Maybe.

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But it seems like the developers have either lost interest or are moving on to something else.

Most people don`t want to use an engine with unknown future. Problem is that Conitec and JCL don`t communicate anything about future developments.
"We are working on a new WED" "We are working on an Android port". But once you ask any detailed questions there`s complete silence. Not even any answer.

The game engine market`s low budget sector (Unity,Torque,C4) is developing fast at the moment. Gamers want to see great graphics and stuff. And to deliver that you need to have an efficient workflow and good tools. The easier artistic workflow is the main reason for me to seriously think about Unity on the long run.
And I`m really the last one who likes to go that way.