Sure you can skip it, but if you plan to take tough and weave (as most willpower tanks tend to do) stamina could become useful. Experiment some 
You can become a better Gauntleter/Damage dealer from having it and slotting your attacks with more affordable acc or rechg plus health stacks regen. With a taunt aura like RTTC its not a bad idea. Oh yeah you'd be better equiped vs end drains at keeping toggles on.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Just get on and play, you will soon discover if you need Stamina or not.
WP includes an end recovery power which is better than Stamina, so you may well decide you can do without it.
I really should do something about this signature.
I suspect if you are running tough and weave or other power pool toggles you will need it but can probably wait until long after lvl 20 to pick it up. On my WP/Ice I started to notice my end suffering about lvl 30 without fitness pool but it was still workable at that stage - I had no problem managing it until I could take the two prereqs and stamina.
I could probably have carried on without it until lvl 50 but I suspect I'd have needed to take the occasional break between mobs.
Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant
Just a quick question from a new player. I'm thinking about building a willpower/energy melee tank,and it seems to be a build that doesn't consume much endurance. Plus it gets a power that already makes endurance recover more quickly,so is it stamina needed anyway or can i skip it entirely in favor or other powers?
Thanks in advance for tips