[Klaus]

Yes, there are too many systems on the market now.
I think Panasonic's move relates purely to video. They have been the dominant system for that during the last 6-7 years but they are now facing some competition from Fuji as well as CaNikon.
Pros are willing to pay more for a bigger format once the options become viable (they are not today but tomorrow they will be). So in order to keep their edge in that segment, they really had to go FF.

Whether L-mount will be a big success - I doubt so. But then what will be a big success in this industry?

I'm wondering which systems will die. Ok, Pentax - they are done. I almost suspect that Fuji is looking vulnerable now. Size-wise they can't compete with MFT and quality-wise they remain weaker than FF. Their GFX stuff is hardly mainstream. If it wasn't a religious market I'd also give a negative outlook to Nikon but then it is. Canon is hardly thrilling us but they remain untouchable due to their financial strength. Some may think that MFT is dead but honestly no other system provides small stuff thus I've a hard time to believe that they'll go away.