I love William Shatner's Kirk. I also love Pine's Kirk. Pine really made it his own, as written and directed it would have been very easy for Kirk to just be unlikeable - he is fairly dickish at times - but his impish grin, charisma and chemistry with Quinto really work.
If it ain't broke, don't fix it, and Pine's Kirk ain't broke. Sure, I'd like see - and expect to see - him mature over the films, but that's not the same as having him transition into Shatnerian mode.