At this point, Bitcoin needs no too much conviction for a person to get involved, if the person is good with research then finding out the potentials of Bitcoin will not be something that requires a good referral to explain in details. Bitcoin has its history, it came from a rough sketch and has paved ways for as many Cryptocurrencies that are now in the market, so why then ever think for a day where Bitcoin will fail.
Even among top Cryptocurrency like Ethereum and rest are already up there, that is why it takes a lot to entertain someone into any other Cryptocurrencies because the chances are slim due to just coming into the market and one should be careful during referrals to avoid being the cause of someone's loss.