The situation is a bit different between the two cases: regarding SLS-1, NASA has been asked to investigate the feasibility of having astronauts fly on it, but there's a certain skepticism because this would be the rocket's first flight at all.
Orion command module, at least, is flight-proven, also in the Van Allen belts.
Dragon 2.0 is not.
And Falcon Heavy is still on paper, and four years behind schedule.
And I must believe that two private citizen, 22 months from now, will be sent around the Moon on that stack? Oh yes, if Musk is in search of suicides...
Forgive me if I don't trust Musk.
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SpaceX also is approaching the point of being consistently able to recover first stages, another proposition that at the time encountered a lot of skepticism.
The skepticism remains today and is not about the feasibility of the recovery, but about the economics of the reuse.
The fact that this cislunar flight shouldn't require brand new hardware, as opposed to the accomplished feat of first-stage recovery, also contributes to making this plan seems feasible to me.
Let's imagine a couple of rich citizens, around the moon in a totally automated flight. What if the mission incurs in some problem and these untrained men must take manual control?
And this is only one of the myriad of things that can go wrong. Is not permitted to tourists to go alone even in LEO - or even in some other risky adventure... ON EARTH... and I have to believe that in 2018 they will go around the Moon in solitude? Oh, maybe one of the two could be James Cameron.
IMHO, better to launch real astronauts, take time to train it, and also take time to develop and test at perfection all the hardware. A failure that involves the loss of crew could be catastrophic for SpaceX and for the private venture as a whole.