Yes this is the first Nintendo home console to hit the mark, and only the 3rd home console in history to do it: obviously behind the Playstation 1 and Playstation 2. GBA hit the 81 million mark as was pointed out and by the end of the year Wii will easily have beaten that, bar any catastrophes on a global scale.
As for the future of Wii sales, 85 million by the end of the year would be spectacular and put it in line to at least get to the 100 million mark while possibly passing up the PS1 as the second best selling home console of all-time. Would be quite an achievement, especially in the time it will have done it in. Just going to depend on how long the Wii stays on the market compared to when N6 arrives with predictions putting it as early as 2012 with announcement in 2011. But Wii is still trucking along and with the great lineup it has in 2010, shouldn't falter too much.
