I think this would be a great idea in the future, not only include every planet in the solar system but include all the moons Mars has two and Jupiter, Saturn and Neptune have dozens imagine all the immense gameplay and story that could arise from using every moon and it's their right for binge to do there's so many moons destiny doesn't have to worry about leave the solar system for a while.
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Or like add more story to the enemies we know nothing about like the cabal. Maybe the cabal are taking over planets and things and the guardians have to stop them and it's like a huge war. Like planet side to and it goes on for a long time and if Everyone is to busy grinding on strikes the cabal will get tot the tower so not stoping the cabal has an actual consequence. Or because the planets are being taken over the vendors stock might shorten and cur may only sell crap because he can't get cool items because the cabal are to dangerous this will cause many people to get involved.