There are over 100 million EOS bodies and over 140 million EF lenses
This comes out as for every 1 EOS body there are 1.4 1st party lenses. Assuming 3rd party are 0.6 then it comes out as 1 body per 2 lenses on average.
I would hazard a guess that about 80% of EOS body buyers buy the kits with 1 lens and the odds of adding a 2nd lens is low. Camera kit buyers are not solely Rebel kit owners but also those who buy 6-Series and 5-Series cameras with a 24-105L zoom or other lens.
This comes out as for every 1 EOS body there are 1.4 1st party lenses. Assuming 3rd party are 0.6 then it comes out as 1 body per 2 lenses on average.
I would hazard a guess that about 80% of EOS body buyers buy the kits with 1 lens and the odds of adding a 2nd lens is low. Camera kit buyers are not solely Rebel kit owners but also those who buy 6-Series and 5-Series cameras with a 24-105L zoom or other lens.