wait a minute!... i had the same issues. I tried to bleed the clutch but that didnt help. Found out through some Diagnostics that the Master was at fault. Replaced it and i was back up and running. 1 week later i had the same issues again! This time the pressure plate bolts came loose. tighten them back up and Wa-lah i was back in action slamin them gears lol.
Drive over some rough/bumpy road (Pavement) and listen closely as you tap the gas every so often. If you here something banging, could be loose pressure plate. Thats how i knew something had to be loose that kept me from shifting. If not than yes, probably worn clutch or Master or worse.... The Tranny.
oh and P.S... when the Master was worn out. My Pedal never soften, it still felt the same. Disconnect the line from the Trans and then step on your clutch. If its stiff as hell, than its good. If not, than its the Master.