Personally for a 5d I dont need 45 point AF anywhere from 11 to 19 would be fine as long as the points are fast accurate and have good focus tracking ability.
Anyone's who has shot with a 5D or 5DII would probably agree. Canon isn't going to put an AF system that comes anywhere close to the 1-series, so the best we can hope for is a handful of cross-sensor AF points that are very accurate, or a buttload of non-cross AF points.
People tend to get fixated on whether AF points are cross-sensitive or not, but IMHO there are benefits of in certain situations of having a greater number of AF points, even if they're not cross-sensors, opposed to having a fewer number of AF points that are cross sensitive. Just for kicks, I dug my old 1DIIn out of the attic today, hooked it up to my 70-300L, and shot some pan blurs of cars in rush hour traffic. In this configuration, only the center point is cross sensitive. You need f/2.8 or faster glass for the other 6 cross sensors to work.
Even a body as antiquated as the 1DII has a nifty AF expansion function that varies based on focal length. At shorter focal lengths, it expands to the 6 AF points adjacent to the chosen AF point, and at 200mm and longer, it expands to the 12 AF points that are adjacent to the chosen AF point. Compared to my time shooting under similar circumstances with a 7D, the 1DII yielded a noticeably higher percentage of sharp, in focus images despite only having one cross-type AF point. If not for the 1DII's extra 26 AF points, I'm certain the 7D would have stomped it.