In my opinion, Live Free or Die Hard wasn't needed. I thought Die Hard With a Vengeance provided all the closure the series needed. Having said that, LFoDH wound up being quite a good movie and pleasantly surprised me, so Kudos to Willis and company.
And, having said that, LFoDH should be the last one. Unless they came up with something really good, a fifth Die Hard is out of the question as far as I'm concerned. Like, maybe if they brought back Al Powell or something or some of Willis' cop buddies from Vengeance. Inspector Walter Cobb for Die Hard 4!