If Canon don´t put a real replacement for the 1Ds on the market, they lose a lot of pros.
1. 1D is crop series
2. 1Ds is full frame series
3. 1DX is end of 1D series with crop
But the pattern was always the 1Ds is more of the Studio 1D, where as the 1D was the fast 1D.
But with the 1Dx, it sort of merged the 2 together to just get the full frame speedy camera.
A proper replacement for the 1Ds should come.