depends on what you expect. Fast and Furious 8 did $500m opening weekend worldwide. So compared to that, no, $36m is utter shit since WB will see less than $20m of that money, and a LOT of movies are gonna start opening up soon that won't let Dune get bigger. On the other hand the biggest 2021 weekend opening is like $160m worldwide, so $36m without USA is maybe ok?
I think there is pretty much no way WB turns a profit on Dune for a while, budget was $165m so it'd have to pull over $400m worldwide (incl USA) to be profitable and thats unlikely at this point even with China. However if a ton of people sub to HBO Max on the weekend it opens, and it has good WOM then maybe WB thinks its an IP worth sticking with.
There is also a bene gesserit TV show in pre-production, but its not much more than an idea right now with no scripts and not much beyond a showrunner (2nd one, first quit).