OK, I’ll say it for him: we should never go.
How do you keep your bones and muscles at the same level of efficiency in 40% of Earth’s gravity? How do you deal with an atmosphere which provides little protection against solar radiation? How do you keep from being poisoned by perchlorates?
Some problems have technological solutions. For example, we might one day develop a reactor or some other energy source that will let us move huge amounts of equipment across space to Mars at minimal cost.
But some problems have no solution. How do you survive in the freezing vacuum of space without a space suit? There’s no pill or implantable apparatus that we could dream up which would allow this to happen.
In a similar vein, the challenges I outlined above aren’t likely to be solved by technology, because Mars is just hostile to organic life.