I am willing to bet all my BTC that your intended Steemit audience cannot participate in OTC markets so this is not all that interesting. OTC is for the 1%. You need a minimum of $100K-$250K, usually way more. OTC for BTC has been going on for a long time. It's not just about the Exchanges not being able to fill orders. OTC brokers are used in cases where individuals are trying to circumvent exchange controls because exchanges are not trusted. The OTC market is anything but convenient as the process is long. From finding a counter-party to negotiating a price and if in the US KYC due diligence is needed. Exchange volume doe does not represent true market-based Bitcoin supply and demand.
The most important thing for your audience to understand is this... until we have a marketplace where OTC is not needed to fill large orders, BTC will continue to be extremely volatile. I do not see this happening any time soon. Exchanges cannot operate in this market effectively nor do they want to be in this market. The prefer taking in high fees from small buyers.
RE: Watch the OTC market