I don't think any console but the Wii could possibly claim a real "victory" this gen, although I do think that the PS3 will pull well ahead of the 360 in a few years time, unless MS does something pretty fantastic.
It is possible that the PS3 could approach the Wii's numbers in a few years -- as a percentage, but I think overall may be out of the question at this point.
The only way Sony could actually overtake the Wii would be by some Blu-Ray miracle, making Blu-Rays the defacto-standard in the next couple years, and a slimline PS3 at $299.99 or less. Not impossible, I suppose.