So I was off a little, for 2008 HD had 35% of the total US street bike market. Too early for '09 numbers but the various large MFGs had similar percentages in slips of sales ~ 30 to 40%, so I'd guess they have a similar market share for '09, albeit much smaller.
2008 total street bikes – 611,133
Motorcycle Sales Statistics - webBikeWorld
2008 HD total sales – 218,939
Harley-Davidson motorcycle sales, shipments and revenues - a knol by Bobbie7
35% of total US Street bike sales
Look at the Japanese MFGs, they have more cruisers than sport/standard bikes so that shows they know what sells in the US.
Don't get me wrong, I like pretty much every catagory of motorcycles; dirt bikes, touring bikes, adventure bikes, even scooters...well except cruisers, hate 'em. All I'm saying there is very little demand for adventure bikes especially in this craptacular economy and Yamaha will not bring an "old" bike back to the US, the land of the newest, latest and greatest.