Satoshi, in his invention of the blockchain, had given us the inch, what is preventing other bodies or organization from taking the ell?
I think you need to tell us what is "ell" in this context.
Does it mean no coin hosted on the blockchain will gain mass adoption enough to bypass the users of bitcoin?
Nobody knows. It's possible another coin will become more popular than Bitcoin.
The government own billions of population
I don't know what exactly you mean, but as reminder not everyone live under dictator.
Last question please forgive me, what stops them from building a coin on the block chain that'll bypass the total sum of bitcoin users, and regulate it?
Nothing can stop anyone can create regulated/centralized coin. Although i doubt it'll surpass Bitcoin in terms of total users/owner.