Please don't characterise what "other developers" think so casually. Obviously I think it's viable with some internal resource scheduling work (which is needed anyway), and Satoshi also thought it's viable. Many others haven't even weighed in, as far as I know.

Also, what makes you think it didn't work? I did local transaction replacements on private testnets and it worked fine.

I edited the section to remove the pointless editorialising and simply state the facts as they are.