Hmm then we are really going in different directions. The topic is "Who Will Blow Up/Dominate in 20xx?" I take that to mean some kind of mix of commercial success (sales ranking), industry prestige (awards, spokesperson jobs, top billings on company websites) and fan love (search ranking, # of tweeter followers, lots of well-attended fan events).
But seems you guys are twisting the question to "Who will become my personal fav AV star?" If you talk about unfulfilled potentials, you know who's my nomination without me saying it (4-letters).
One of my top fav is Aimi Yoshikawa. But objectively she's not a star, not even your Sasa Handa level. I like Aimi very much, I don't know why she's a fail in the industry, but she is. There are quite a few current and past idols who can be said dominating. Say for example, Ai Uehara. I just couldn't make myself like her that much. But no matter how much I didn't like her doesn't affect that she was a star, a top star. It's objectively true.