Both Canon and Nikon are working on
FF mirrorless now, probably shooting for 2018 Photokina. 645 and K1 didn't prevent the camera business from going further south as the latest quarterly financial report reveals. I think Ricoh must embark on FF mirrorless too, if not already, to give Pentax a fighting chance. It is do or die time now.
You've boarded the hypetrain I see.
Mirrorless ILCs are a part of the market.. However they aren't the end all, be all of ILC design.
There is a popularity in online social media driving mirrorless cameras right now, much in the same way as their was a social media hype driving tablet sales 5 years ago.
While I don't think the two are directly related.. I think the hype is.. how many bought a tablet expecting some great experience only to realize it was a giant smartphone? That's fine except it wasn't some grandiose 'game changer' to computing as some loud online voices touted.
The point being there is and will always be a market for DSLRs... even if that market shrinks..