There are two diff. markets, Pro and everyday shooter. The Pro will cont. with DSLR and wonderful L lenses.
Not true. Many professional photographers are using mirrorless systems.
IMHO, don't need to worry for Canon... they already had the technology to come out a good mirrorless camera anytime...
IMHO, I don't think so. Both Canon and Nikon have been in the SLR game so long that they have millions tied into research and development that has not yet paid for itself. The insistence by Canon to slap IS into basically any new lens is proof of this assumption. This also means that they have been spending a lot of dinero on perfecting this technology, instead of simply binning it in favour of new ideas.
I do not believe Canon and Nikon are "past their prime" ...
As far as the "enthusiast" segment goes, yes, both Canon and Nikon are past it. I agree with you that both companies are severely missing out on a very lucrative market.
... so I think CaNikon are just biding their time.
Personally, I have my eye on either the Olympus E-M10 or the Fujifilm X-T1 for my non-super-telephoto stuff ... as neither Canon nor Nikon has anything to compete with these cameras. Once I've bought into either (non-Canon) system, I also won't be contributing to Canon's profit for a time.
There is no need to research in mirrorless camera for Canon or Nikon. When you shoot in live view, you are actually using a "mirrorless" camera already... just without EVF. With dual pixel AF, Canon had all the technology to make a reasonable fast mirrorless camera anytime...
Actually, I would prefer them to make a hybrid system... put an EVF behind the prism, so you had a setting that enable the EVF to turn on when the mirror is up and you can lock the mirror in up position if you prefer to use the EVF, but I guess if this going to happen, it'll happen to the 1D series... not a camera I can afford... ha ha ha.
Have a nice day.