The installed base is kind red herring, because most of the worlds largest companies use Oracle to hold their data. So you'd have to get Oracle on board.
Could there be a better alternative, oh yes, most certainly.
E.g. Every company I worked for needed to do SQL migrations. Unfortunately that isn't a part of SQL. Could it be? Yes! Is it? No! So everyone re-invents the wheel...
SQL is a language that expresses relational algebra, killing it is like killing any other language i.e. nearly impossible because there is still code sitting around written in it, thus needing competent programmers to maintain, competent programmers who will be asked to write more code and will choose to do it in SQL if they can get away with it, rinse and repeat and so forth.
Once a language has a certain installed base it may be eternal - what size that installed base is I don't know.