I think you may be right, they will probably adopt the Hulu business model for introducing ads. I mean, it clearly works.
Pluto TV is pretty amazing. They have been adding some really good movies and television shows lately. I am not sure what changed but they seem to be pushing hard for more better known content.
Pluto TV is also a great option. I find myself watching it more than I do many options I pay for. Also, Tubi TV is a great one to check out if you have not yet. Free, ad supported, and has a ton of great content on it.
RE: Netflix Contemplating Advertising Supported Subscription Model