And Yamaha need not explain their decisions as to whether to import a particular model or not to the likes of us mere mortals.
However you can be certain that the reason they did this is because in their opinion they weren't selling enough units to justify investing in inventory - these things have to ordered and paid for a year in advance and both the mother ship and the US importer (which is a separate business unit with a separate P&L responsibilities have been going through hard times.
You can also pretty much bet that since there is still old vehicle inventory (I've heard there may even be a couple of 2006s buried in warehouses somewhere) and dealers don't exactly push the product they decided to allocate their resources elsewhere.
I suppose that in Europe, where ST bikes are a lot more common (as a function of the overall size of the market) they ARE ordering product - and remember that with the sinking US dollar, Japan isn't seeing as much revenue from the much more aggressively priced units sold here than they do for units sold in Europe, where an FJR costs $23K.
So, (and I'll make an assumption that perhaps 15% MAX of the FJRs out there are AEs) given that they sold all of 10,000 units in the US from 2006 through mid 2010, importing 400 units a year, going through emission certifications and so on, they decided that they're better off bringing in sport bikes and cruisers, which they sell in multi-ten-thousand-per-year volumes.
I suggest thaty keeping the FJR A model alive (let alone redesigned) is also not necessarily a given, if things get worse for the mother ship.
