No, Destiny wouldn't be better without the Crucible. PvP isn't the reason why PvE had the lengthy content droughts that it has had. Even in the video the person making the video noted some major changes to weapon power were made due to PvE. Overall it appears Bungie wants a balanced game (including PvE). Bungie knows that people aren't going to complain about them having an "unfair" advantage over the AI. As a result Bungie seems to be using the mindset of if its unfair to use against you its unfair to use against the AI in regards to balance. Ironically enough the person who made the video pointed to a very important point about Destiny without PvP. It wouldn't have the replay value needed to keep people playing, PvE just isn't strong enough to carry the game on its own. In addition the gripes about the changes to PvP (at least in this video) come from Bungie opting not to put a ranked playlist or at least keeping private matches.