I am not talking about Jurasic Park, I am talking about in general about all the demos the Unity Engine has. They even have Animation short series in youtube like ADAM, among others.
They have to do an actual game.
Well you did say "this guys", meaning these guys. They could very well make a game, and gathering from the Demo, they seem quite interested in a JP game.
They don't have to force their hand to make a game though, as that's up to them.
Besides, there are people out there making games that use the Unity engine anyway.