Joking matter or not, you have already answered your original question in the first post.
You said that you always reach for the Sony.
You are also worried about the resale value of your 7000 dropping, which tells me that you already made up your mind that at some point you want to sell the 7000.
I don't see what all the drama is about.
I wouldn't want you to leave Nikonites just because you no longer have a Nikon camera, and you shouldn't have to.
Sell the 7000 enjoy your Sony and stick around to share your wonderful images.
If the answer was already stated, then why am I still confused?
You have to look at the bigger picture here...isn't it mostly true that when new gear is purchased, it is used the most in the beginning and the older gear is placed aside.
Example:
You buy a new car with all the latest technology with great horsepower...say a BMW.
The older one still runs great, but it is showing it sign of age and the engine & technology is no longer up to date...just say it is made by Mercedes-Benz.
Both brands are excellent cars, but which one will you take out for a night on the town?
Knowing that either car will take you from point A to point B.
Do you really "need" both cars?
Should you sell the Mercedes while the value is still good?
Probably not the best example, but I hope you get what I mean.
Just to confirm...I don't own either a BMW or Mercedes!