Have a good time with your new game engine.

Some time ago their users had to pay extra for shaders and networking.
They have different prices for indie and commercial developers, so check if there is more restrictive in their EULA.

I don't think all gamestudio members will drop their gamestudio license, just because they can buy something different.

You are a registered member since 2005, I guess you learned a lot in that time and it might be easy for you to transfer your knowledge to a new engine.

But how easy is it to script the new engine after you created this nice level with all your mentioned tools and features?

Best wishes
slacer