My 2cents:
- we have always been able to use a 3rd party player for BD in general if you need/want features not in MC (such as 3D or native menus)
- the recent change Jim mentions will let users run a external player for 3D (needs expanding to Discs as well as files however) without the need for the script I posted
- the trade off will be you will be using the external player and will not get all the goodies MC can do (madVR, Video Clock etc) but that is the nature of the trade off
- there are projects in the open support community for features like native BD Menu support and if this, and/or 3D (MVC) is created I'm sure MC will support it
Till now this is a good balance between what can be done VS going down the Licences Player approach and all the downsides this would bring (cost and restrictions).
On 4K, I'm massively skeptical as there is no commercial 4K material and most would not have a 4K camcorder either. The BDA (BD Association) is currently reviewing their spec so lets see if a 4K option is ever released. Even then you will need a large screen and a short viewing distance to discern the increase in resolution.
Yes 4K = diminishing returns for 95% of the population.
Unless you sit real close, or have a massive screen.
Interestingly I have just recently started to experience 3D discomfort for the first time, particularly with Pompeii. I'll have to go back and check some of my other films, but I think it's just the conversion of that particular film. I haven't changed anything else in my system.
I accidently got MC theatre view in 3D the other day when I was playing with my scripts, it looked great, but I don't know how I did it!