So expensive? It has never been cheaper to create movies thanks to digital cameras and non-linear editors, digital audio workstations, etc. You are no longer encumbered by the costs of film, development, renting an edit bay, requiring an audio editing studio to mix audio and maintain a tape library of special effects or hire foley artists, no need for an optical printer to layer visual effects, etc.
You already can produce a movie in your basement, many of which can be found on YouTube.
Like with all generative AI this comes down to how specific you can get, and how consistent you can be. If you can art direct each element of the frame, down to the design of the individual props and scenic items, and have those items remain consistent from shot to shot. Then do the same with lighting, actors, camera characteristics (eg lens, focus, position in the scene, framing), etc, etc, etc, then maybe you’ve got a chance of making a ‘high budget movie from the early 2010s’. But I haven’t seen any generative ai that comes even close to this level of control or consistency… They’re closer to slot machines than anything consistent…
Yup, you can notice some issues even in their picked example. e.g. the prompt for the video of the painting woman says "there is a bear cub at her feet" and it quite clearly is not "at her feet" in the video.
You already can produce a movie in your basement, many of which can be found on YouTube.