The only reason I dont think your tranny is dead is you stated you noticed NOTHING metalic when you changed the oil.
what color was the oil? did it have gray/silver particles floating in it?
In our bikes the oil usually still looks like oil but a bit darkened and If I see any gray/silver looking colors in any dropped oil I get a bit concerned.
In a bike with a wet clutch you are going to have some particles floating around but not excessive.
Of course you might be just on the beginning of a major trans meltdown.
Take it to the dealer and see what they say.
A dealer is not an option for us so we'd have to run it till it fails then just slap in a new engine.