Granted, I don't have access to their stats, but does Sea World really get "a high volume of visitors"? Sure, it can get crowded in relative terms, but nothing like Disney crowds.
And even if they did, they are primarily a family park. So only a small percentage of their visitors would want to ride this.
For those reasons above, plus added expense, I wouldn't count on a dual loading platform. I suppose you never know, and it'd be a very pleasant surprise, but it doesn't really make economic or practical sense to me--just wishful thinking from fan boys (the same ones who were earlier insisting that were trying to insist in the high probability of this ride being something else that fits the stats--wishful thinking).
Yes, the lines will go slow because of the nature of the ride, and it likely will get somewhat lengthy, but at the same time, I think the lines for it will be much shorter than it is at other parks where it's installed because they are already geared towards being thrill parks. This isn't. It'll be interesting to see how long the line does get, compared to the other installations, but I'm going to gamble they'll be shorter.