Here's what I see. Dodge dropped their big block completely. Ford's big block is a V10 that makes 362HP, and is a $700 option. Chevy's big block retired at 330HP and was $1100 option.
Ford can keep their V10 in production simply because it shares parts and geometry with it's 5.4L 300HP V8 model. And it's a favorite for budget motorhomes.
But for pickups? The Powerstroke Diesel is a $8000 option that makes 350HP. It's the #1 Superduty engine. Next comes the 5.4L V8 with 300HP, base engine. Far in last place is the V-10. Ford will probably keep making it for awhile, but I doubt it will be around in 10 years. It is the most advanced design for all the big blocks, but demand is very low.
Why? When my V8 Ford van was in the shop, the loaner I got was a V10. My van would get 15mpg. The V10 was 11 mpg. HOLY COW!! We are talking 1960's fuel economy. Ditto for the 8.1, may it RIP. Dodge had the same issue with their V10 before they canned it. Too small of demand, too low of mileage. The diesel offerings while way more expensive, tow better, and get modern fuel economy with similiar power.
The BBC was actually dead the minute the diesels went over 300HP, the writing was on the wall.