It's hard to say at this very moment whether or not Hatch could remain a starter in the long term, but there were only three starters in MLB last season that had a higher RPM on his fastball than the FG-reported 2550 RPM on Hatch's fastball: Mike Minor (2650), Justin Verlander, (2577), and Jeff Samardzija (2559). Yu Darvish (2533), Gerrit Cole (2529), and Andrew Heaney (2524) are the only other starters above 2500 RPM. FWIW.
Edit: Also of note, Elite SP/RP John Gant had 2515 RPM on his fastball.