i personaly see Rock Raiders and Power Miners as being part of the “crystal war” category, basicly, LEGO themes like these have crystals as the main focus and both sides of the conflict want the crystals (which are for the most part energy crystals). Legends of Chima is technicly in the same category, because the Chi crystals are basicly energy crystals, but they have a more mystical origin to them, than being natural crystals full of energy.
And about Rock Raiders and Power Miners, i would like to point out that, while Rock Raiders have a more “darker” color pallet and tone, the rock raiders main goal was to gatter crystals so that they could power their space ship and return home, thus basicly a stor of survival on an alien planet. Power Miners on the other hand is about how the power miners have to stop the monsters from causing earthquaces, which as we learned in the first video from Power Miners, could get so bad that it could destroy most of the uper portions of the earth, while Power Miners had a more cartoony color pallet, the main story was actualy rather serious, given just how serious of a threath the monsters actions are to all life on the planet.
but anyway, i would prefer for LEGO to make another new space/mining LEGO theme, heck, they could allways try and add elements from their past “crystal war” category themes, like Aquazone, Insectoids, Rock Raiders, Power Miners and Life on Mars for example.
I would be interested in seeing how the line would be like if that happend.