It very well could be that this "Schedule" release was simply a way to stir the pot and get everyone talking about SCORE again. Give them time, they will probably change the dates back to the long standing dates.
I know there is competition between the series, but in my opinion there doesn't need to be, at least not much anyway. SCORE, BITD, and KOH have used roughly the same dates for their races for many many years. And while there has been some conflict occasionally, for the most part the teams that race both series could make it work. I know SCORE believes they are the "premiere" desert racing series in the world, but they are not the only minnow in the ocean. And when a number of the class (TT) that brings you the most exposure also races other series due to sponsor obligations and media exposure, it doesn't make sense to crowd the dates of other organizations because that only hurts your number one exposing class.
No offense to the other classes, but the reality of it is, all the orgs need to cater to the classes that bring them the most exposure. These classes bring the most crew members, most fans, and the most sponsors which in turn brings more exposure for the promoter and in turn helps the promoter procure future racing venues.
The issue here clearly lies on the shoulders of SCORE, since they are the ones changing their long standing dates. I hope that there is a legitimate reason for doing so and not just trying to step on other organization's toes.