1. Stealth gameplay- Add an offhand dagger with 3 options for spells. Each can be a 3 second stealth with different effects. One could have a slow and DoT on hit out of stealth, another could have a speed boost in stealth, and another could be a small nuke on hit out of stealth. This way you get stealth 3 seconds out of every full cooldown cycle and can't use it to both engage and disengage at will. Instead you have to choose whether to use it as an engage OR a disengage.
2. Add an arena with more controlled pvp options so that solo players or people playing with just 1 or 2 friends have the option to enter organized pvp. Right now the risk of getting zerged in open world pvp is a deterrent to solo pvp.
3. Add more bosses with more interesting mechanics than just a giant frontal cleave every 10 seconds. Have the boss spawn adds perhaps? Maybe have aggro drops midfight or add stacking debuffs that force tank swaps as well. You could add dps race phases i.e. blow up a bosses shield before it Albion Online Silver explodes and does aoe damage and you could add hps races where massive damage goes out for a 5 to 10 second period and healers have to coordinate in which order they use shields and heals on the tank.
I am not sure how you can manage it, but the game economy definitely needs to be balanced. I think that this is something that can only be done in an extended test (maybe during a beta) or adjusted after launch. It takes more time for an economy to settle out than we had in this alpha, so I wouldn't put too much thought into the player responses on pricing yet, but I would find it comforting to know that you had some sort of reasonable way to deal with this planned for the future.