Currently I think we pay $15 total for all our streaming options. Much nicer than the DirecTV bill of $100+ we used to have.
But yes, in time "ala carte" will probably start adding up and could be hitting cable pricing.
For now my plan for 2019 at least is to stick with Netflix (free), Hulu, and Disney+. I don't have plans to invest in the more fringe services that cater to more obscure movies.