Guys, while I highly doubt anyone would want Samurai to be a DPS more than me, we have to realize that SE has already planned it to be a tank. Back when Heavensward was announced along with the three new jobs, the topic of the new tank job was brought up many times.

YoshiP, the man himself, said when they first started to brainstorm ideas for a new tank, many jobs were on the list of potential candidates. Some were quickly scratched off, while others remained on the list for a good long while. Just days before they officially announced DRK, YoshiP said that there were actually two jobs still on the list, and that the team had a very hard time deciding between the two; Dark Knight and Samurai. This means that BOTH jobs had an extremely fleshed out kit as tanks. Hell, even the day DRK was officially announced, audio files for Samurai were seen on the sound director's PC during the stage show. This means Samurai went extremely deep into development before they finally settled on DRK as our new tank.

If they were that happy with the idea of Samurai as a tank, even going so far as to be undecided till mere days before the announcement, then it makes reason stare to suggest that they would throw all that away for all future content. It is EXTREMELY likely that Samurai will not only be a tank, but it will almost assuredly be our next tank in the next expansion.