I am an August 2015 bride, slowly but surely getting all of the bigger vendor selections done and then taking a break until this fall/winter to start working on the smaller details. Today, I got an email from a photographer saying that he could only confirm a conditional meeting to discuss a possible contract because he is already meeting with another couple with our same date. In that way, depending on the outcome of the meeting, we can arrange to talk or not.
I know it is normal that many people want a lot of the same vendors, I was just on a somewhat (mistaken) notion that booking things 16 months in advance was being "early". I can know acknowledge that I was wrong: Early is now apparently the new late.