point 1: possible, so buy the protectors..., I did not. fell a dozen times. no problems yet.
point 2: buy the protectors, i did, no scares on it when I fell on it, but yes the covers are brittle.
point 3: There were problems, in early models only I was told.
point 4 and 5: 2 year warranty? At that time, let your dealer check these items and let him decide if the parts are due for replacement, although I feel the problems are not very common...
I have had no problems with my bike.
Open up the air filter (3x3 mod) and replace the standard muffler header by the E type, and enjoy a few extra horses for very little extra money.
I lost very much sleep on deciding for this Suzuki, because I was afraid it would be to tame. But as I own the bike now for 2 years, I have never had a bike giving me more pleasure then this one. (and I ride for 25 years).