"Canadians will eventually adopt (HD) for FM at least?" Really? Guess ol' Lee-know has some kind of direct line to insiders in Ottawa. Seems to me that Industry Canada announced precisely the opposite in October, citing the well-known potential for interference superimposed on Canada's lack of third-adjacent protections. IIRC Canada was going to wait it out and see how the IBOC rollout was going to go in the US and elsewhere. And they have flatly rejected AM IBOC because....(well, the system just sucks.)
Yes, there were concerns about analog incompatibility dating back to the 1990s and the first days of Project Acorn and USADR. There was a hope that a system which "interleaves" digital data with analog modulation would emerge with advancing digital technology. For whatever reason, this never happened, so "IBOC" morphed into "IBOC/IBAC" from practical necessity for digital data to spill into adjacent channels, linked to the fond hope that the interference wouldn't be "too bad." Since iBiquity's efforts to unilaterally revise the Laws of Physics ultimately proved unsuccessful, the arguments against IBOC are as valid today as they were in 1992. Sic transit "IBOC".. a moniker as intellectually dishonest as the term "HD" when applied to radio.
Comparisons with European broadcasting are not very valid. Commercial broadcasting on the Continent is vastly different in every aspect than US radio. There are far fewer stations, there is no satradio, the programming is immensely different, and on and on. Canada's experiment with Eureka147 has flopped because the country's population is too sparse and far-flung to function practically with the limited coverage from each site.
So "survival instinct" is the best rationalization you can come up with for IBOC-AM? Driving away what analog audience remains with obnoxious noise and diminished coverage, in the hopes that someday listeners will come back to AM to listen to the same ol' programming "in digital" isn't "survival instinct." It's "kamikaze."
Many an animal, while running to safety while in peril, has instead obeyed its "survival instinct" and run to its destruction. If only the critter had common sense and the ability to reason, it would have lived. The example of the panicked horse which makes its fatal dash back inside the burning barn is tragically familiar to anyone familiar with equines. Mankind - in this case, radio broadcasters - are presumably smarter than animals which have no choice but to rely on "instinct."