There was an game that did this (obviously nowhere near as well) called 1NSANE. I spent hours smashing cars off of things, because I find the destruction so interesting and awesome.
Things I'd love to see:
* Soft body on soft body. Imagine Destruction Derby 2 with this stuff.
* Explosion modelling - Stuff getting ripped apart and sent flying.
* Aircraft destruction modelling - if you could clip your wing on a building and have your aerodynamics adjust accordingly.
I'm glad you mentioned this. BeamNG was actually founded out of a game called Rigs of Rods, which in turn was influenced by 1NSANE.
What you ask for is possible in Rigs of Rods (although soft-body on soft-body is usually enabled on a per-vehicle basis). There is a plane that ships with RoR (the Antonov) that actually starts to wobble and shake apart at high speeds (I believe above 150 knots).
Things I'd love to see:
* Soft body on soft body. Imagine Destruction Derby 2 with this stuff.
* Explosion modelling - Stuff getting ripped apart and sent flying.
* Aircraft destruction modelling - if you could clip your wing on a building and have your aerodynamics adjust accordingly.