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Five years from now? Idk, I mean the world could even change fast in only 1-2 year (yeah F u covid-19 
).
But for now, I think the ones that are in groups will still had a strong power.
Actually almost all of them is just getting to start their career path like you said, OP.
Even for Yujin-Wonyoung and Chaewon-Sakura, their groups are just starting, so.. yeah.
For Nako and Hitomi.. idk, because I didn't know much about 48 groups contracts (it ain't like the kpop's 7-year contract).
I didn't know when both of them would graduate from their group and start their new career path, but let's see how it will unfolds later if they do.
For the soloists, yeah I think Yena had the most (thanks to her early hard works in many variety shows). Let's see how her comeback in this August! 
We will also see how's Yuri and Eunbi's results in both of their endeavour outside of musics, because music-wise, all three of them had a good concepts. They just need to build up their name in the public.
The same for Minju and Hyewon. Both of them are just started their acting careers. Minju with her MBC drama and Hyewon also rumored is on shooting.
Now for Chaeyeon... yeah let's hope the best for her and her company
