If you look at the most high selling batch of metric cruisers out there....the Honda VTX, The Yamaha Roadstar Series, The Hot rod Suzuki cruiser, The Kawasakis.....vulcan 2000 or even the 900 all are shaft drive are they not?
Cruisers by definition are just that...cruisers not specifically designed to be all out performers in the quarter mile although from what I have read the Suzuki M109 is a very good performance cruiser at 1783 somewhat smaller than the Honda VTX 1800 , The vulcan 2000 or the Yamaha Roadstars.
I think that what the target consumer is looking for in a cruiser is good smooth usable linear power all across the power band and in the engine size from 1300 to 2000 CC a shaft drive simply makes sense.
Triumph is going in the right direction.