Yamaha is going crazy, they are trying to knock off Honda as the sales leader, and every bike they make is top of the line best, but their sales are not there yet, Yamaha won't bring a new model to the U.S. unless they know it will sell, (they want good sales figures on their current models before they release a new model)
The Tmax has been in Europe since 2001 before it was brought to the U.S. in 2009, and the Tmax isn't selling, dealers are still stocked with new 2009's, and there has been talk by Tmax owners that Yamaha is going to make a 750 Tmax, NO! Yamaha will never make a 750 unless their 500cc Tmax sells increase.
You have to understand its a much different motorcycle culture in Europe than in the U.S. In Europe people own motorcycles as commuter vehicles (many people don't own a car, just a motorcycle)
In the U.S. most people own a motorcycle for pleasure riding
2009 Yamaha TMAX
2008 Suzuki King Quad 750AXI
2011 Toyota Tacoma 4x4 DC Trd Sport, 6 sp manual