Agreed. I don't think it's necessary for Wonder Woman to go back to her swimsuit look, but I'm glad the fact that she wore it for decades of her published history to be a part of her current continuity. The redesigned costume incorporates everything great about her classic look, but updates it to something more befitting an Amazon.
In my own personal canon, she started with the skirt, and adopted the trunks soon after. The reason for the ever-dwindling size of those shorts is an untold tale involving Dr. Psycho's team-up with Crazy Quilt to subconsciously influence Wonder Wonder into thinking that she could accomplish her mission in Man's World better when we all saw more of her butt, culminating in the epic Crisis on Infinite Wonder-Thongs event