The concept of DVD/Bluray sales being a profit center for these movies who fail to make a profit in their theatrical runs comes up occasionally, so I went and looked...
Here's what Aladdin did in DVD/Bluray sales after its $1 Billion box office back in 2019: $44 Million. While $44 Million is better than a stick in the eye, surely that's not considered a hugely important profit driver. $44 Million is about half the box office that Aladdin did in South Korea in '19.
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And Bluray sales are declining further every year. Last summer Minions: Rise of Gru did $940 Million at the global box office, but has only sold $18 Million in DVD/Blurays.
If Mermaid ends up with roughly half of Aladdin's 2019 box office, and you account for four more years of rapid technological change and crashing sales for Blurays, I can't imagine they'll sell more than about $15 Million in Mermaid Blurays in the next calendar year. Probably only $10 Million is the safer bet.
Again, not that an extra $15 Million is a pain in the butt, but let's realize that Bluray sales are rather small now and getting smaller every year. And the manufacture of DVD players for home use is not a growth industry.