The constantly depleting mana is a resource system unique to the werewolf. It's what makes it different and stand out to builds like pounce zon/sin and the reason it is way more powerful than those builds in the first place. Removing that mechanic is not something that we are looking to do. The changes coming to this build next patch are two fold:
1) You won't be able to equip jewellery with mana regen post morph and reverse the mana degen. To compensate Mana Pulse will grant significantly more mana compared to before - it will now fill up your entire mana bulb in 2 hits.
2) Werewolf single target has been buffed greatly to enable you to kill bosses better without a respec and Harbinger damage is increased slightly to compensate for the fact that you are not casting it all the time but have to switch to mana pulse every now and then.