I would guess they would create a new name for such a different (larger) bike. Why drop the 790 cc America...it's a perfect bike for some, the SpeedMaster just affords a slightly different look (on the same basic platform). This is not unlike the 4 Bonne variations...the standard, the blacked out, the T100 and the Thruxton. Fairly simple diversification like blacking out the engine, a different seat, wheels, and bars allows T to reach a wider audience. If they lost the America, what would replace it? Speedy variants with different seats and wheels? Nah they'd just keep the America name. Plus historically they haven't minded having different names for bikes on the same platform aimed at different audiences (Bonneville and Thuxton, Speed Triple and Daytona, America and Speedmaster), no need to reuse the America name IMHO.
