Maybe if bitcoin becomes very popular perhaps the elites in power now will stage some type of blackout and send themselves 50% of bitcoin?
You're obviously mistaken about what a 50% attack can do.
Sending 50% of bitcoin to themselves is not what the evildoers could achieve by staging a global blackout.
Double-spending attacks, well, possible, but there would be no targets to launch them at. There'd simply be no one to accept those double-spends.
Receiving 100% of the block rewards for the time of the blackout? Absolutely.
That's somewhat less than 4000 BTC per day of the global blackout.
4000 BTC/day in comparison to the huge negative impact on economy during the global blackout?
Well, no one said powerful elites were smart. But stupid like that?
edit: typos