The proof is in the tasting of the pudding. Why else would developers prioritize console development?
There are even AAA titles that are console only like Destiny. Heck, AAA first party titles that probably cause 10s of millions to make can even survive off the sales on just one console - sure the console manufacturer can take a hit but there is a limit to how much it can do so; games that don't sell enough will have to killed off sooner or later.
Edit: Also
http://www.cinemablend.com/games/Wit...les-72064.html
For AAA games, consoles are king. (No surprise there. Top of the line PCs to run AAA games aren't cheap. You will frequently need hardware that is higher spec than the consoles because the developers can't optimize as heavily due hardware variance - and the higher level APIs to hide said variance.)
Your 1.7 billion ... how many are $5-$10 games?