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Yes Mars is at present the only planet potentially accessible. But one day, why not dream to go even further? But to be able to dream to go further. We must give a planet in a good state to the next generation.

There is a chance even Mars could be out of our ability but it sucks we haven't even been able to try and go to Mars yet.
We can dream but I think we would need some scifi technology to be able to make it out of our solar system and from what I have read Mars is the only potentially inhabitable planet in our solar system.
We do need to do a better job with our planet. If will be nice when we get all of our solar power up and running.

Hopefully, you all will first save your planet Earth before occupying and destroying another planet !!!