Barthes is here talking about written literature, but the case is in some ways even more applicable in film, where a director by definition has to collaborate with a number of other people--actors, directors of photography, screenwriters, to name a few--in order to produce the text. That text clearly cannot be considered the singular result of any one person's vision, control, or intentions.
I realize these films have a fanbase (and make gangbusters if there have been so damn many of them), and so have redeeming value of some sort, but this sort of shameless pandering to sponsors doesn't exactly make me excited to jump into the series at this point.
I haven't seen the sequel yet, but the first film clearly took a lot of interest in the spectacle of men's bodies and the fraughtness of Holmes' rather intimate dependency on Watson when it clashed with female interests. Moreover, there's a very sizable body of queer criticism on Doyle's work, and Richie is clearly giving that work some breathing room in his adaptations. Doyle's books have always been pretty queer, so it's kind of odd to expect that a 21st-century adaptation would try to excise or simply ignore that aspect.
To be a bit blunt, I think it's equally naive when people feel the need to make with knee-jerk "no homo" defenses when there's obvious, sustained sexual tension between two male characters, and especially those who are otherwise ostensibly heterosexual (as opposed to Holmes, who is a confirmed bachelor). I'm not saying you suggested this at all, but there are certainly folks who would see the first film, hear someone suggest there's a gay subtext (or overt text), and say, "Stop trying to gay up our action movies!" or "You're putting it in there!" My colleagues and I hear this from students on a very regular basis.
This sort of reading hinges on privileged, heteronormative assumptions for folks who need a clear dividing line between straight-straight-oh-so-straight cultural objects and, well, the gayer sort put out by TLA. The assumption here is that most cultural objects are (or at least probably should be) somehow "pure" of queer insidiousness of one sort or another, and that the world was probably better when men could "just be friends" without having to worry about being mistaken for lovers. While there might be straight-straight-oh-so-straight cultural objects out there, Sherlock Holmes simply isn't one of them.
Richie's films acknowledge that there should be some sort of middle-ground and play space between homosexual panic-y and boringly gay-affirmative (what you call "revisionist") adaptations. In the end, I like to think the ambivalence makes for more interesting movies, and movies which are probably truer to the dynamics of friendships. Platonic ideals aside, friendships can be pretty complicated things whether or not they're between same-sex people, and whether or not those people are having sex (or thinking about having sex) with each other or any number of others.