yeh for Japan, silver for Women's Team, and Gold or Silver in Mixed Doubles (ITO / MIZUTANI) is the most optimistic+realistic outcome
although one can't really blame Harimoto. He's played really well last month in China. He said he was tired which I believe. He's only a kid, and he's studying hard besides just training.
Oikawa is a regular training partner, they play in the same T-League team, so that match had a special flavour. We all beat regularly a team-mate which is stronger than us, and we really shouldn't but we play with him all the time, we know his serves, receives, tactics, what he doesn't like etc...
Also, Oikawa has been playing many matches in T-League recently, he really is in good form. He's not a nobody.
So, i'm not overly worried for Harimoto. I'm more worried for Niwa. The end of the road for him in JNT is approaching fast.
---
regarding world team events,
there are many teams i can feel can beat Japan apart from China: Germany, Korea, Taipei, England, Sweden, France notably but they can still beat all those teams.
Boll is getting old, in what form will he be ? LSS level is going down, CCY as well, Pitchford is strong but how about his mates ? etc.....