I think the comparison with the Daytona 675 is really interesting - rather than continue to rely on the 'classic' looks the 'tona moved the class forward significantly. Also I'd suggest the Speed Triple series did likewise for the 'urban' class. The Street Triple, particularly in 'R' guise gets excellent press - but for me the gap is the one that Ducati are exploiting with the four Scramblers - simple, moderate performance smallish bikes which re-injects fun to biking, not just riding but importantly customising too - they really get the urge many have for personalising their machine, as motorcycles are certainly not simply forms of transport for the majority of customers.
The motorcycling fashion has developed (in greatly abbreviated form) initially on increasing performance, culminating in Hayabusa/BB etc, then the rise of the Adventure bikes, 1200GS/KTM/ Multistrada, and now the emergent 'fun' sized bikes, of which the Ducati Scrambler currently leads - I'm looking forward to seeing the other bike makers responses..not least Triumph as surely their Scrambler needs at the very least a serious makeover (and not just a different coloured tank..)