If anyone ever buys a majority share in any asset - whether it's a cryptocuyrrency  or anything else, they're not really subverting it, they basically own it by that point so nobody else will care what they do with it.

Personally, I hope someone DOES try to buy up 90% of Dash (or 90% of masternodes for that matter) since by the time they get round to doing anything 'subversive' with their new toy, I'll be off ski-ing on my new private mountain in the Alps