IMO, it would have been better if JJ never said that he wouldn't direct the next SW film out of loyalty to Trek fans. He set himself up and can now look to some as if he isn't being loyal to Trek fans. Of course, this is just gonna make the ST vs. SW rivalry even more heated!!
BTW, I don't mean to sound as if I believe that JJ is being disloyal to fans. I am just saying that I understand how it can be perceived that way.
If he wants to direct SW, that is fine by me. I just hope that it doesn't interfere with the Trek franchise / the ability for the next Trek film to be released in a timely manner (i.e. I hope that we don't have to wait years and years for the next one).