Erdoğan unbanned the letters Q, W and X, which can be used for Kurdish texts, in his 2013 reforms, so I think it'd be a bit too soon to re-ban them now already, so that's probably not next.
I had to look this up, but it is a fact that certain letters were banned. I should not be so amazed. Back in the 1960's the Greek junta banned the letter Z, because it meant 'he is alive.'
May as well also get rid of G for gender, H for healthcare, I for intersectionality, L for liberal, M for marijuana, N for nonbinary, O for orange, P for progressive, R for radical, S for socialism, U for union, and V for vaccine.