I tend to agree with Timothy on his points regarding whether a higher displacement is even needed for a bike like the Burgman - I am quite sure however that many would appreciate it, as there is wisdom in the old saying "there is no replacement for displacement!"
I live in California and drive on some very wide and expansive freeways. In Orange County in particular, everybody here has new cars and these, even the largest SUV's most often come with a huge amount of horsepower, as they all shoot out of the stoplights like a bullet, hitting 60mph in no time, even if the next light is red :roll: quite a funny sight. They are all in a hurry and carry monstrous amounts of power. Even the "Soccer Moms" are driving around with 260hp 6,000lb SUV's as if it were NASCAR. On the Freeways, if you aren't cruising at 75mph, get out of the way!
In this environment, the Burgman 650 can easily pace and even outrun (when needed) most of these vehicles in traffic, and thusly I don't see the point of needing any much more power than it already has. In driving long distances in wide open roads, the Burgman as most of us know is quite comfortable at a 70-75mph pace.
Often in the past I have thought what even a 1 litre Burgman would look, feel and drive like, and concluded: "What for?" It would only increase the weight and practically eliminate the 'ease of use' appeal of the "scooter." Well then it would likely translate directly into an automatic transmission Gold Wing. I'm not sure that is appealing to me anymore.
Although the Burgman 650 is already a fantastic motorcycle, what would definitely improve its overall existence would be lighter weight to make it more manageable at super-low parking speeds, somewhat like that of the Burgman 400 - THAT would be a really great feature, and to respond with the notion that "more is better" I feel the Burgman would be better off with "less."
In addition, rather than a simple increase of displacement I would rather see Suzuki spend their efforts at developing a creative solution to compensate for the "engine braking" effect at slow-down, pass on the "auto-folding" features as standard, put an automatic raise/lowering windsheild, fixing the dieseling sound, making available more accessories so as to develop a good "customize" market --- THAT is what I would like to see in future Burgmans, not more engine. Minus the dieseling sound and the engine-brake effect, the current engine, drivetrain and chassis is fine with me.