So what exactly is your problem right now? You said you own a scarlet w, did that camera somehow become less capable now that the new line up is out? You said " I just want to buy a camera and not have to think about it for a few years", what is it that you have to think about now that you own the scarlet and there is another camera out?
Don't get me wrong, the things that Red do sometimes feel a bit backwards, but I just don't get these kind of arguments. You have a very good and capable cinema camera and unless you just buy stuff to put on the shelf for you to look at, you should be making the invested money back without a problem.
Now I'm getting really curious about the c300 mk2. The price is propably going to be around $15k so I wonder how many they are going to sell next to the fs7, if the improvements are like this.. Especially when there is the c500 to protect.