Get the F Back In

Not that they ever would, but if they really wanted to, isnt WWE now leagally able to change back to WWF or are they just allowed to say it again when it comes to their archives? 

After 16 years, I still hate saying WWE. It just doesnt look and sound right. 

I get it, that to their newer fanbase, WWE is all they know, but to a long time old school fan like me, WWF is what I still wanna call it.

Short answer, no they can’t just do that.  
Longer answer, they’d be suicidal to do it even if they could.  The WWE branding is worth BILLIONS of dollars.  But if you want to call it WWF, go ahead.