Now days you can get internet for $50 or $100 (depending on location, speed etc).
Then if you wanted say 5 of the various platforms, that's going to roughly be $50 to $70 more. So that's still a likely savings.
And on top of that, all new movies are basically being PRODUCED by these networks, so for the most part you don't need a theater (or their prices).
And on top of all that, instead of just fully subscribing to all of them, just get one at a time. Want the new Dexter series, get Showtime. Done with that? drop it until season 2 is out.
So it definitely can be a lot cheaper than the old days.