1Ds Mark III - Aug 20, 2007 (35 months)
1Ds Mark II - Sep 23, 2004 (24 months)
1Ds - Sep 23, 2002
So... what now? Anyway not telling anyone not to stop buying. Just saying be aware.
You conveniently leave out the data point that there is NO true update yet for 1DsMarkIII ...or if one is lax, you should at least co-opt 1Dx as an update (which Canon said it was)...which was October 2011!!! 50 Months
from the 1DsIII.
Selective listing of data to argue your point doesn't always help convince anyone.
Lets take the best and worst case scenario to support your rather flimsy thesis...
Even if one assumes that 1DX is "partially" a replacement for 1DsIII, that is 50 Months
from 1DsMarkIII announcement to 1DX announcement in October 2011. Which you fail to list.
Much worse, if one assumes that 1DX is not
the 1DsIII update, and this true high-MP update is yet to be announced, then it is 67months
and counting as of now...
Either way, you leave out a key data point.
Any further contortion of the timeline is just plain silly and can only serve you to hold on to your rather weak prediction.
No one in their right mind is expecting a replacement for 1DX anytime soon