Evolution itself does not have a goal. If humans were to eventually evolve into single-celled organisms over time because the conditions allowed the lessening of complexity to be favorable, it would still count as evolution.
"Decline in empathy" which in itself is already hard to prove globally, could also easily attributed to how we work socially, not how we work biologically. Also, you couldn't achieve a 40% "decline in empathy" with evolution only in a decade.
A "decline in empathy" has nothing to do with brain capacity, per se. This could be a reasonably compelling "because" argument for the original premise, but does not support the premise tree we are presently in.
I disagree with you. You clearly don't understand evolution (The atrophy of an organ doesn't cause the loss of a genetic trait) and also using our computers is still making different areas of the brain work.
"Brain capacity" is more than just for storing and retrieving knowledge. Not using your mind to seek information would not decrease brain capacity, but would rather decrease neural connectivity. Our ability to reason comes from our frontal lobe, not brain size.
Search engines could promote the human mind to evolve and reference information in a more Transactive manner. This is done by encoding 'meta-data' regarding how to find the desired data rather than actually saving the specific data itself.
We are still using our brains, but in a different manner