HBO needs a new blockbuster now that GoT has ended. They better hope they get WW right going forward.
It's too bad that instead of HBO Westworld and Sony Dark Tower movie...there wasn't just HBO Dark Tower series with the quality and scope of Game of Thrones. It was a rumor forever. There are some similarities between Dark Tower and Westworld.
A Dark Tower series would have been cheaper to produce because you could have as much as 40% take place in modern setting without much effects and still create an insane sci-fi/fantasy landscape. It may not be a coincidence if WW goes away from the wild west setting and more towards just 'slightly future' areas.
The problem with Westworld is that it doesn't need to be a series unless there is some amazing new stories and characters underneath the premise. In terms of source material it isn't a proven packaged hit with a great market tested story the way GoT, Dark Tower, Harry Potter, LotR, or other hit book/comics long series properties are.