FUT hair transplant strip scar. Will it get better as time passes? (Photo)

Strip scar will always show if you keep your hair very short. If you are concerned you can consider SMP but the scar may still be somewhat visible (if you keep you hair very short).

Unfortunately FUT scars are unpredictable, and sometimes scars like yours occur.  If it does not improve, there is a chance that by you could break the scar up by having FUE grafts placed into the scar. 

You will need to allow for the scar to fully mature before making an assessment as to how it healed.  On average, it may take a year for the scar to fully mature.  Trichophytic scar closures will even allow for hair to grow through the scar, allowing for further camouflaging of the scar.  If after a year, you are still concerned with its appearance, measures can be taken at that point to allow for further camouflaging of the scar.