Twitter hasn't provided any further information at this stage as to any possible successor.
It is worth noting that it added a new 'Conversation Insights' feature to Media Studio in November last year - so could be looking to point people to this platform for future analytics.
Advertisers see Early Promise in TikTok’s Self-serve Ad Platform.
Introduced last Autumn, it’s getting good reviews from advertisers for being relatively easy to use and providing good value in terms of increasing brand awareness.