After watching the BBC program Miracles of Nature in which a treated mobile phone was dropped down a toilet and survived, can we urge Canon to consider weatherproofing bodies and lenses in the same way.A small, pedantic thing - not intended to de-rail this thread. Hydroscopic / Hygroscopic actually means 'water-absorbing'. See http://www.merriam-webster.com/dictionary/hygroscopic
Consider shooting in a monsoon and not having to worry about water damage.
What we want is 'Hydrophilic' - water-repelling.
Regardless of dictionary definitions, water-profing requires more than a water-repellent coating.
It also requires careful engineering so that all potential points of water ingress (think buttons, switches, displays, battery-compartment, CF-card case, electronic interface points (HDMI, USB, N3, X-Sync, etc.) are also made to resist water ingress.
Not a simple task.
Many of us complain about the cost of new Canon bodies - being this waterproof would add to the cost (unless you buy a 1Dx - which is largely already water-resistant, but won't survive a swim at all.
The immersible cameras that are on the market are often mono-bloc in construction, with few external controls or parts, in order to limit water ingress.