Second hand prices for Americas/Speedys are low here too.IMO when Triumph went from the 790cc motor they should have got to 1,000cc+ but still no 1200cc cruiser from Triumph that I can see.As you say they're concentrating on the Bonneville.
I'm old enough to remember when 1200cc Harleys were the biggest displacement bikes made and a 650cc Triumph was a big bike.