Today most people earn billions of dollars through investments. Some of the richest people in the world also own millions of dollars in investments. Anyone investing in real estate, or an industry, because they know that a million dollar income is possible with just one investment. Real estate investing can make people rich over time. In the same way, a person can become a financial magnate over time in Bitcoin investment. Just be patient and keep investing.
You sound like, most of the people who earn billions are not rich, as rich are only earning in millions. I don't think it's a good motivational speech or words to motivate one to invest in BTC. As a newbie (or an old user) we should see the stats, like where BTC was 10 years ago and where it is now. If a person wants to do the comparison of BTC with real estate then its there own decision and analysis. The comparison of Real estate with BTC was a good one. As it also gives people a clear idea of which investment would have made them more money.
I think real estate has its own perks but no doubt BTC is highly portable, it can be sold to anyone in the whole world. There is no repairment, taxes, mortgages, etc. BTC is clean unless you are living in a country where it is banned then you might find it hard to deal in BTC.