Big Budget movies are now essentially two hour commercials designed to sell toys ( All of Marvel and Disney ) and product placement ( Audi in all of Iron-Man movies ) for big brands, they are no longer a product in itself the way a self-contained cinema experience was designed to be. No, movies won't whither and die, - quite the opposite, we'll see more...ALOT more movies...Marvel for example wants to churn out a superhero movie every 6 months, reboot-rinse-repeat.
It's filmmakers with an independent creative vision who are metaphorically withering and dying in Hollywood, being replaced by marketers and stylists instead. Cinema will continue to exist simply because watching a film with your friends is a social experience in itself, which does not compete with that other cool movie you will watch on your iPhone/Netflix, a new home for modern independent filmmakers.
I don't really see what the problem there. You want global audiences? They are there, at the click of a button if you are willing to forsake the champagne at the festivals and the elitist "I've been screened in a theatre, bitch" smirk and go into the most competitive global digital marketplace. Look at David Fincher, the guy did it with House of Cards, and the audiences showed up, - I'd readily view his next movie exclusively online.
And Alejandro Gonzales Innarritu shot his last film on VHS and released it online, because he is an artist who doesn't care about the festival circuit and the big honors of theatrical releases, he creates because he likes to create, and he shares using whatever medium is at hand.
Spielberg and Lynch are just afraid to adapt to this change, that's all...to them I say, grab a 5D and show us what you can do without a million dollar budget, your talent is now laid bare. David Lynch can have an army of volunteers of actors and crew if he only asked for it on Twitter, his movies can be shot with ANY camera, he could be shooting and releasing several movies a year to online audiences if he wanted to and yet he sees obstacles instead of an opportunity in digital.
Dinosaurs...