You'll find claptraps to rescue fairly early on in General Knox's expansion so donn't worry! The other expansion packs aren't done yet (on my part) so I don't know about them.
End of 2016 hardware sales:
Wii U: 15 million. PS4: 54 million. One: 30 million. 3DS: 64.8 million. PSVita: 15.2 million.