Well one interesting way to measure the market penetration of Bitcoin, that is relatively accurate and verifiable is the GWP (Gross World Product, sometimes called Global GDP) to Bitcoin Market Cap ratio...... All goods and services sold in the world in one year, according to The CIA Factbook amount to roughly $120 Trillion and the Market Cap of Bitcoin just happens to roughly be $120 Billion, so Bitcoin is pretty close to One, One Thousandth the size of the world economy....... OR One Tenth of One Percent. For Bitcoin to hit 1%, the price has to grow by a factor of 10x, so it needs to be at $72,000 per Bitcoin to be 1% of the world economy:-) and $360,000 to be at 5%......I like those numbers becasue they can be backed up. I will put the links below:-)
https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html