The only change that can happen to 5K tourney is its removal (which is unlikely to happen in near future).
The room staying empty most of the time was a thing I warned people about, because it's expected that top belts won't spend most of their time playing in a tourney room - especially with ranking season being now active. Belt restriction won't be lowered, there are other tourneys that lower belt players can compete in.
Tourney room mod rotation can be changed / tweaked every now and then as long as there's community consensus on mods people want to play, but don't expect it being 3 aikido variations and nothing else.