@edgarblythe,
I agree that we have the tech basis to accomplish the mission as stated. Anything that could come of it will be discovered while its in progress.
Discovery has always been so. We go there cause we DONT have all the answers.
If the first mission fails, the whole concept would probably be back burnered like Goddards Rockets were until Germany woke up to the pioneering work Dr Goddard did, and built on that.
As far as the Mars mission, probably within a few decades later someone will come up with a burning need to try again, until, by applying what wed discovered during the failure years,the whole thing becomes a sustainable and relatively safe undertaking. Eventually were gonna do it no matter what the doubters say .
I think we will occupy deep seabeds along the same time scale.Gold mining from sulfide mounds (like "black smokers" is already being looked at as an "investment grade" undertaking). I don't think that's an any less challenging enterprise than a MArs Mission.