What would a 7 year old rMB be like tho? A Pro is just an aged machine, powerful to begin with. The rMB is behind to begin with. The rMB V2 may kill it off? Seemingly non replaceable batteries will make for dead 7 year old batteries... not that portable if it needs to be plugged in all the time.
Very much a throw away when its out of warranty and broken in any way device. On purpose? For the price?
Just stuff i would think about. Maybe wrong in every way.
Even the "non-replaceable" batteries on the current laptops are replaceable,
user-replaceable if you are reasonably handy, why would the rMB be different? Who knows about broken, mine is well out of warranty and although I've dropped it a couple of times it keeps on chugging along. Considering the MacBook is basically a small fanless motherboard with a big battery I think it will be much easier to repair; just buy a battery, a motherboard, or a screen assembly. My trackpad button broke years ago so I just use tap to press, force touch doesn't even have a button to break.
Seven years from now the rMB should be able to handle regular tasks just fine. Having 8GB RAM and a very fast SSD means that it won't feel as slow to the user. It's best to look at upgrading at least every five years.
If most of your time is spent in browsers, Office, iTunes, photo retouching, etc. there is no reason why the 1.2 won't meet your needs for at least five years. If you need to do serious work, it only makes you look like an idiot to complain about the MacBook's limitations.
But all of this ignores my seven year old computer still being supported by the latest version of OSX which I posted as a response to "...Old, underpowered machines are dropped from support. Phone, Pad and Mac." Hell, Photos is faster than iPhoto which means seven years newer software runs even better on my old computer.
It's fine to be eyes-open critical of a bad product, but the majority of the anti-rMBP posts are made by people who believe that everything Apple makes must somehow work for them. And the fact that Apple didn't make the MB as powerful as the MBP or Air angers them.
To sum up, almost all the bitching about the MacBooks performance is a result of unrealistic expectations and sour grapes that Apple didn't make a retina MacBook Air (which I would have really liked).