I think that's the idea at this point, similar to rolling a small portion of your salary into a retirement account. For example, GMO (the Japanese internet conglomerate) is rolling out their options this way:
Taking a rough estimation of Japanese wages across a corporate firm, I would guess this 10,000-100,000 yen limit is something like 1-10% of monthly wages, depending on the position. Personally, it's a bit upsetting that I've had money locked in my employer retirement account for so long with no access to Bitcoin investment options. I hope we see 401k options next year.