This will never happen, Twitter authorities who do not understand the blockchain technology at all and they negatively relate to the whole cryptocurrency sphere and therefore they constantly ban all their users who advertise any cryptocurrency.
The question is; when blockchain is globally adopted or accepted, will twitter migrate to blockchain? Absolutely YES, the advent of blockchain acceptance will introduce it usefulness to the entire world ranging from Finance, Technology, Religions, Social Medias, Medicals and Travels agency, so, nothing will withhold Twitter from not migrating from their current status to the blockchain. The acceptance of blockchain technology will pave ways to all in other industries.