Threads like these give me cancer.
Instead of asking 'is it possible' you could just wait and check back every now and then to see if someone *releases* an 'unbanner' or provides steps on how to do it.
Usually until that time, it's safe to assume that it is not possible.
This said:
PRESENTING THE WORLD'S FIRST GTA 5 UNBANNING METHOD V1.0.0 BY UNLEASHTHEFURY
100% LEGIT, NO VIRUS.
Step 1: Buy a fridge
Step 2: Acquire a time machine
Step 3: Grab a beer and put it in the fridge
Step 4: Another drink is fine too
Step 5: Wait until drink is chilled
Step 6: Enjoy drink
Step 7: Use time machine to go to the 16th of May
Step 8: ????
Step 9: WOW IT WORKED! +rep +thanks +subscribe +rate +comment
Get banned in the future? WOW! THIS THING ALSO GOES IN REVERSE!