NASA's next Mars Rover: a suggestion...

Dear NASA:

We've been amazed and delighted by Curiosity's wonderful pictures and discoveries, and I really hate to say anything critical about it, but let's face it, we ought to get more than three miles out of a set of tires before those get holed by the sharp rocks we knew were there, right?

So please try to put better wheels on the next one, OK? 

And while we're thinking about making oxygen from carbon dioxide, obviously with an eye on somebody needing to breathe over there, are we forgetting the whole place is on the bitter outer edge of the habitable zone around the sun?
As far as I can tell, being there would be a lot like being in our own arctic, and I've been in our arctic, and it was a great place to visit, but I wouldn't want to live there. Not if I had a choice. And we do have a choice, don't we?

Mars was probably a lot like an early Earth, but that was then, and this is now, and there's no way we can get back its oceans and its other missing features destroyed when it was hit by that object from space which punctured its crust about three and a half billion years ago. And when that happened, both Mars and Earth were very likely in orbits closer to the sun, and therefore a little warmer. And all that is very different now, and we can't turn back the clocks.