You may have heard already, but they raised the volcano alert level from1/5 up to 2/5. It still seems fairly safe. Our guest houses should be ok, unless there was a major eruption. They are not warning people out of Hakone, but just around the Owakudani area:

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https://mainichi.jp/english/articles/20190519/p2g/00m/0na/010000c

Personally, I am not very concerned. Our guest houses are far from Owakudani. I will teach at one of them each week.

If they suspected a major eruption, they would close everything down. They haven’t.