Stocks and real estate will crash when 'everything bubble' pops, so buy gold, silver and bitcoin, says Robert Kiyosaki

• Robert Kiyosaki warned an "everything bubble" spanning stocks, bonds, and real estate would pop.
• The "Rich Dad Poor Dad" author touted gold, silver, and bitcoin for riding out the storm.
• Kiyosaki's similar warnings in the past haven't panned out, but he has made some accurate calls.

There's a massive, multi-asset bubble that will burst — and investors should take cover in precious metals and crypto, Robert Kiyosaki warned.