The decline begins... Square Enix, heed my call.

[Pinworms]

I really like point 2. You do totally need to omit the doom and gloom that's only going to get you negative feedback.

[Alberel]

Whilst I think some are going to be unnecessarily harsh on you OP simply for your negative view on the game's current performance I'll agree that you have good suggestions. I'd been considering the dungeon one myself as we really do need an incentive for experienced players to re-run lower level content to help new players through it.

With regards to the guildhests these should actually have a weekly reset on their bonus experience in my opinion. As it is they are only ever run once, and if they were made per-class as you suggest it would not entirely resolve the issue with them. A weekly reset would give them a more permanent bonus and they would act as a good boost for more casual players.

I feel I should highlight, however, that the 'bored' players you describe are not bored as a result of lack of variety of things to do. Most of them are bored due to endgame tunnel vision; they ignore most of the content available to them that doesn't involve raiding and gear progression and thus declare a game devoid of content despite them not having touched half of it.

Judging by the content of patches 2.1, 2.2 and 2.3 revealed so far there are a lot of new game systems planned for introduction that will give us many things to do. The catch is most of them will be non-combat which means they will not satisfy the bored players you describe. In reality these bored players will likely remain bored no matter what. If they have more variety in means to progress their endgame goals they will simply find the fastest option and grind that endlessly despite their boredom. I've seen it in countless MMOs.

More variety in systems and content will be good for the likes of you and I. For those you describe though... let them go, they're the same players who cry boredom in every MMO ever made. They will never have an MMO to satisfy them unless they have the developer make it bespoke for them and focus entirely on one content type.