Congratulations on joining the proud and exclusive family of BMW wagon owners.
I also have a 2010 535i (E61) wagon which I enjoy. Looked at the current 3 series wagon and liked it, but the cargo space was too small for my two dog crates. My wife recently purchased a 2016 BMW X3 because the crates would fit and she liked the way it handled and performed better than her 2009 Toyota Venza. My wife and I are both vertically challenged so the leg room in the front seats of the X3 is not a problem for us.
I keep hoping BMW will resume importing the 5 series Touring into the US. Because only about 1,000 E61 vehicles annually were sold in the US, I understand the economics behind BMW's decision not to offer the current F11 (5 series) wagon here. I am still searching for a future replacement for my E61 or maybe I will just keep it for another 5 years.
BRM, are you a member of BMW Car Club of America?
https://www.bmwcca.org