The only way Wii could hold on to 50% is if it becomes a phenomenon beyond even today's thoughts, or has a lifespan far better than the current other two.
But, today you see the Other charts, and Wii's looking at 128077 out of 238079, which is 53.8%. Japan will boost the numbers well against XBox, and overall the sales are great against PS3.
But, 53.8% is not going to cut it.... There's still 6% to make up. It would still have to sell close to 60% week by week for a while to hit that 50% mark.
Numbers: Checker Players > Halo Players
Checkers Age and replayability > Halo Age and replayability
Therefore, Checkers > Halo
So, Checkers is a better game than Halo.