That's also what Intel and HP thought when they developed their Itanium 64 bit processors. Then came AMD with their 64 bit extensions to the year-old 32 bit architecture. And the rest is history...
Yeah, except that the companies behind other architectures have had the good sense not to make their designs
baffling and hideous to program for, which was one of the key factors that sank the Itanic.
Odd statement, because AMD and Intel have proved you can keep updating a 32year old architecture and it does just fine.
They've kept it up thus far, but it got so crufty that they had to offload it to an entire separate RISC machine all the way back in 1995. It's impressive that they've kept it competitive, but I don't think they can do that
indefinitely.