I've owned bikes with four drive systems, chain, enclosed chain (a very nice compromise), belt and shaft. The idea of a belt or a chain spinning around sprockets exposed to all the crap that floats around the road strikes me as extremely inelegant, it makes me think of the time between the first motorcycles and the 1930s when motorcycles had exposed valve gear.
I prefer shaft drive and cranks in line with the wheelbase but if you go to a belt the transverse engine makes more sense. I wouldn't mind if the RT lost weight but it isn't a big driver for me, YMMV. OTOH, the BMW is in my garage because buying a new Harley touring bike would have meant a bike between 850 and 950 pounds and I just wasn't willing to spend a big pile of money on a bike I couldn't even pick up by myself, I had enough trouble picking up my K1200LT when it fell over in my garage during an earthquake and I was a lot younger in 2003.
I had my dreams of road racing superstardom dashed when I was racing with the AFM in the 1970s, I'm just not that fast. Add the years and miles since then and I don't use more than 50% of the RT's abilities day to day and I doubt I ever get to 80% on my fastest days chasing one of the more aggressive guys I ride with. Your riding is your business but if your speed is being limited by the RT's abilities on a twisty road I strongly suggest you should get a license and do some club racing. You'll have a huge amount of fun, everybody is sober, going the same direction and has passed both training and bike safety inspection. Drunks, people who have a 350 degree blind spot and other forms of rolling death are banned from the track. It is much smarter than riding WFO on the street.
OTOH, if you just like a smaller, lighter, more agile package for your street riding I understand. Unfortunately, humans and especially American humans generally believe bigger is better and more is more fun. I'm pretty pleased the RT is still available, anything smaller as a touring bike would be a very tough sell in the product planning meeting. I'm slightly surprised BMW built the 800GT after the poor sales of the 800ST. If we go to fantasies, yeah, I'd love to see the technology that can produce a 450 pound, 150 RWHP superbike used to build an RT like bike with a full fairing and bags that weighs 500 pounds wet, carries 6 gallons of fuel, has a clean, low maintenance final drive and the wonders of cornering ABS and ESA. The $30K base price might be a problem 'cause my RT started a lot lower and it broke $30K before I was was able to take it home.
Quite frankly I think the shaft-drive is an inelegant way to transfer power to a rotating rear wheel. Two sets of u-joints, 8 bearing sets in all. Right-angle turns. When crap blows up in them they can lock the rear wheel. Nope, never have been impressed compared to the quiet, efficient, clean, maintenance-free belt on the F800 I put 23K miles on. Longitudinal crankshafts don't work so well w/ belt drives hence you pretty much have to use drive shafts.