My Idea for a Single Player Epic RPG

I've been working on an idea for a single player epic RPG. I've made a list of the top twenty things I'd like to see in my game. Here they are:

The Must Haves:

1) A huge, full and detailed gameworld that is different every time you play (procedural generation)

2) Freeform, non-linear gameplay. Complete the main quest at your own pace, or ignore it entirely

3) Open skill tree for maximum character customization

4) Materials-based item crafting. If it can drop, it can be crafted

5) Quests are different every time you play (dynamic, scripted procedural quests)

The Wants:

6) Dynamic gameworld that changes based on the player's actions

7) Emergent quests (unscripted quests, see #6)

8) Guilds

9) Crafting mini-game that's short but fun

10) Mutiple main quest endings

11) Potion Crafting

12) Scroll Crafting

13) Pets

14) Allies

15) Diplomacy

16) Mounts and mounted combat

17) Player owned houses and ships

18) Player owned businesses

19) Other 'heroes' that complete quests, sometimes joining you; sometimes fighting you

20) Paperdoll

That's it. I've thought about it for a while and there isn't really anything else I want in a single player RPG.

What about you? What would you want in your dream RPG?