I think we're all getting side-tracked here.

Counting the number of titles in which Samurai and Blue Mage have been included doesn't seem like it will relate to FFXIV all that much, particularly as FFXIV is a stand-alone game. I agree with Frankenbeans, a number of Pro-Samurai players are highly vocal and tend to be aggressive both in tone and content, as if by intimidating others into silence, it will somehow increase the odds that the Spiderman shirt references Samurai. I also don't think these people need necessarily be acknowledged beyond the content of their posts. There's little point in policing tone, when the internet is a pretty terrible place to convey such subtle aspects of conversation.

Logic indicates the Spider-Man Shirt (the topic of this thread by it's very title) would reference Blue Mage. It takes, 'Mental Gymnastics,' to convince one's self or others differently. Spiderman's very story is that of a Blue Mage, in essence.
Logic indicates through data-mined files that there is a high probably that Samurai will be added in Stormblood. These files could be false and meant to lead us astray, but they're still more solid than speculation on a shirt.

Looking at the two above, I can't help but conclude we'll get both Samurai and Blue Mage in Stormblood. Spiderman's shirt references Blue Mage, and Samurai files have already been added to the game files. Seems pretty simple and straightforward. The -true-, 'Mental Gymnastics,' are the assumptions we'll only get -2- new classes for Stormblood.