I think its about time they Removed Mechanicals, Back in legion they were cool and all, But since the release of the Tome of Bone-Binding, I feel its time this family gets removed similar to how Rylaks were moved into Chimeras, Now I could see a few issues with certain pets not fitting into a set family, But I feel we have enough pet families to fit them all, Some examples include:
The Mechanical Rabbit & Squirrel being moved into the Rodent Family (Considering the Family has a Green Skunk, Beavers, Weasels, Otters and many other Animals that aren't truly rodents, I think they'll fit fine.)
Aquilons going in with Feathermanes (Since they're mostly comprised of Quadrupeds with Feathers and/or Wings of some sorts, They fit the best for Aquilons.)
The Mechanical Sheep going into Gruffhorns (While Sheep & Goats are extremely different to eachother, I personally feel this is the best way to fit the sheep in, Unless blizzard wants to make a Livestock family.

Mechanostriders going into Tallstriders (Considering they are both similar in Animal Type and Because I feel Mechanostriders don't belong in Waterfowl.)
The only models I can think of who don't truly have a Family are the Chickens, They don't fall into the Bird of Prey or Carrion Bird Category, So I'm a bit stumped there. (Feel free to suggest where they should go!) But otherwise I don't really see the point in having the Mechanical Family anymore, Pretty much almost every model has a family they can go in and the combo of Cunning with a Defensive skill just isn't that good, So i'm hoping that for TWW will remove it and give these models a new home. :>