I think Meta is going to merge WhatsApp, Instagram and Threads into a power app that does it all.
It's going to start by adding Threads to it. It only makes sense for Threads to be one of the options.
The pieces are already big. Instagram has 3 billion monthly users and Threads has 500 million. Threads already grew off the back of Instagram, where an Instagram account makes a Threads profile easy to create.
One app, one login, every way to talk to people. I'm watching for the day Threads shows up inside it.