Hopefully they could stay away from the tanking aspect and get back to the much more awesome damage dealing ninjas. Instead of getting shadow images they could possibly give them a decoy (like the log thingies in anime) that they can use on a relatively long CD that drops a lot/all threat. That could give them that stealthy feel while not backfiring into blink-tanking.
FFXI: DamienSlvrblade Race: Elvaan Nation: San d'Oria Server: Sylph 2002-2007, Phoenix 2012
PUP WHM PLD MNK BLU BST SAM WAR BLM 99 BRD THF NIN DNC SMN RDM 50+
FFXIV: Damien Scott Race: Duskwight Elezen GC: Limsa Lominsa Server: Ultros
DoW GLA50 ACN50 PUG50 MAR 50 Rest30+
DoH/DoL All 40+