I believe you misunderstand my post or are you trying to use my post as a example of the main issue getting more players to play Tank Job in Group content?
Either way, the point is SAM Tank will only be considered as a Tank Job that successfully solved a bit of the Tank Population issue if it actually has a noticable effect on the Tank Population in Group content.
As you said we can have a 100 players playing SAM Tank but if only 10 actually use it for Group content then it has not changed the current issue of Tank Jobs in Group content being the lack of Tank Players in group content.
Either way SAM Tank or SAM Dps we are looking at a major outcry to Group content populations no matter how it goes. People who want SAM tank will support it for their own reasons, either because they see it as the only way to be a tank, want to be a "cool" samurai as a Tank, think the "cool" factor of being a Samurai is enough to make people play a Tank in group content, or "anime" reasons, and people want it as a DPS will support it as a DPS for their own reasons as well, either for sword dps, focus on causing a slaughter fest with a sword as a Samurai, or "anime" reasons.