Wondering if the developers have thought about making players who show themselves openly to be a Werewolf in the game hostile towards other players, and players who choose to be vampires made bounties by Vampire Hunters (as i don't think you can hide vampirsm, can you?)

If they could why not make Necromancy into the game as well? As it is seen as an Evil form of magic, practising it should give other players the choice of attacking the Necromancer, if they see the dark art being practised.

How I would like this to happen, there should be a tab or option that says how your character tolerates Vampires, Werewolves, or Necromancy.
Players turning into a Werewolf or raising the dead will be attacked by those that are strongly against. Neutral players would have a choice. Strongly for would have you defend the Werewolf or Necromancer.
Buff the current skills of Vampirism and Lycanthropy. Make necromancer reasonably tough.

I would also like to see factions that oppose these three skill trees, that can give you a skill tree to oppose them. Something similar to the Vigilants of Stendarr, and the Silver Hand.
Quests given out to go Vampire hunting, or to slaughter a pack of werewolves, or merely to stalk a suspected player of necromancy and report back should be given.
I would love to see myself wondering around, when in the distance a pack of werewolves are attacked by a bunch of Vampire hunters, I of course being neutral sit back and watch the show.

A player strongly against Werewolves might find himself in a group doing a quest, all of a sudden, one in the group transforms, he attacks, but only to find out, that all of his fellow adventureres were sadly Werewolves.
Or of course, vice versa. But this being said, you could all be hostile towards each other, but still accomplish the quest. Take down the stronger enemy to then fight amongst yourselves later.

I believe this would make the choice of becoming whatever you want a bit more of a choice as a opposed to Vampirsm makes better dps (I'm not too sure how it currently is, but I would like it)

This is a great idea!

Cas

I am sure Necromancy will come later in the game via a guild about necromancers or a new class with a necromancy skill line.

Also your Monster hunter idea, I do not think should take place in Cyrodil, but if they release another PvP zone I could easily enjoy a pvp zone where players (all factions) team up vs "monsters (all factions)

I migth be wrong but I think that Figthers guild is suppose to be "monster slayer" skill line.

great idea! i am also sure that they will add nacromancy later however i think we will be forced to fight against it.

the beast hunting stuff you said are also great but since teso is an ordinary theme park game i doubt they will ever add it xD

fighters guild is the monster slayers as someone else said