Well, we could always try to re-do the salt flats the natural way -- -- lay back and wait some 10,000 years or so (no mining whatever during the eons) and let natural forces do their tricks. Of course -- it might not work that soon, but I betcha it'd do so eventually.
Seriously -- doing anything other than nothing might or might not work -- but it'll take one heck of a lot of energy (both in terms or ergs and human grunt and brainpower) and resources to make even minor changes. I'm not condoning the conditions as they are today -- just trying to take a very realistic look at what's what.