This comment i slightly off topic but regarding investing long term into a a Sony system it's as safe a bet as any other system right now in that we do see third party vendors investing a lot more into them in the last 18 months than they have in the last 10 years or so. Much of that has to do with the impact of the FE system.
No Sony is not a perfect camera company by any means and there is a lot of room for improvements. All things considered I personally rather them update their bodies on a yearly basis than have to wait 2-5 years for them to fix the shortcomings or wait that long only to find the successor to the camera you have is NOT the camera that you want.
Sony DOES have a PR issue but it didn't just start with the E-mount. They need to go out of their way to state who they are, what they currently make, what they're building, what they're building towards, put more cameras in the hands of more people doing the types of work that are complimentary to what they are offering, etc... Mostly to shut up the detractors that spew ignorant opinions for whatever the reason. I understand the cameras aren't for everyone and do come it's the closest thing to a FF 35mm digital back.
When Sony made those wonderful products (that everyone seems to love now but didn't buy when they were new like the A850/900) there were plenty in the CaNikon camps crapping on them because they didn't have tilt/shift or other specialty lenses - which naturally made the system as a whole "crap." All of the basics were mostly covered but it didn't sell as well as the inferior camera systems (from a technological standpoint.) What they did have was AF Zeiss lenses and built in IBIS for every lens. We saw how far that got them in the DSLR market.
If you're looking for an investment talk to your financial planner... or buy a Leica M special edition and keep it sealed all cameras lose a lot of value in a short time.
P.S. Jorgen The D610 wasn't selling for much more than a D7100 around Christmas time in USA and it probably had a lot to do with the D750 which is similarly spec'd. Digital cameras lose value... Nikon puts out similarly spec'd bodies just as Sony, Canon, Panasonic, and Olympus does as well... it's not a big deal.