Maybe you have souped up vision. Lucky you! That helps shooting sports. If I were you I'd test-drive before switching sides.
I suppose having young eyes helps a bit too.
I've shot 1D2n and 1D3 bodies alongside my own Nikon gear and gear from the cabinet, so I've definitely got experience on the Canon side of things and feel comfortable switching. I have effectively zero (~$500) lens investment, and I figure now is a good time to take the plunge. No sense in buying a Nikon 400 if I'm on the fence.
Anyhow. Perhaps I'm unclear on the issue... does the point disappear once tracking begins? As a reference, you can see here a crappy phone camera photo of what I'm used to tracking with:
The point stays on, and stays black the whole time I'm tracking. Am I correct in assuming that the issue is that the point is not brightly illuminated red as, say, the points in the 1D3 I occasionally use?
Based on what's been said, I suppose my lack of understanding for the issue stems from having become accustomed to using much-less-than-professional gear thus far in my shooting career.