Actually, I'm very familiar with the Earthsea series, and find it a much better work of art than Rowling's series so far - much more coherent and convincing world building. (But I did believe Rowling when she said, in that interview, she didn't particularly like fantasy;)). It's hard for me to see any similarities between the Potter books and the Earthsea trilogy.

Someone else made this comparison, though, and came up with the conclusion that Snape, not Harry, is most similar to Ged. I agree, and I think it is Snape who will lose his powers, at least temporarily. (BTW, I also think Snape will kill Voldemort. Harry will *defeat* him by destroying all the horcruxes; Snape will *kill* him. )

Just my two cents!