I remain rather skeptical. I think this is a business win for Apple moreso than a technical win.
The Osborne effect is a social phenomenon of customers canceling or deferring orders for the current soon-to-be-obsolete product as an unexpected drawback of a company's announcing a future product prematurely.
Totally. Don't buy either, Apple is obviously going under. ><
Thing about Macs is, they have this incredible lifetime, annoyingly (to those that like to save with buying older hw) hold high value in resale. Try pricing a Mac Mini from 2012, or Late 2014. Compare a similar compact WinDesk from those years. Though it is interesting to see a pattern, and moreso when it is famous enough to have a name, I do not think the Osborne effect applies here. Today's current Intel Mac will still be unaffordable NIB or used when the 3rd gen ARM Macs are released. I'm not really happy about that.
As I recall, the first switch had the issue of the early PPC chips, 601, was kind of slow, and the boxes not designed well. The second transition in 2006 was annoying because Adobe doesn't like to rewrite their code... they carbonized, and then just kept charging for the same cruft. But frankly, I liked the Classic Environment, and I liked the first Rosetta. I'd like to run the whole shebang in MAME on whatever hw, if others were doing it to make it easier for me. If only MAME had a emulated coprocessor, I'd run A/UX on it.
Apple's current ARMs and OS running on it are already quite amazing, IMHO. So I don't think the new ARM Macs could disappoint. And the same thing here, Universal Binaries, a switch in the compiler to make it easy for devs, and I don't know how it could be easier.
I had a first-generation PPC Mac. It was pretty good, I thought. The baseline 601 ran at 60MHz and had a superscalar architecture with 16K instruction / 16K data L1 cache. The high-end 68Ks were not superscalar, ran at 33MHz, and had 4K instruction / 4K data caches.
If anything was slow it was probably because big chunks of code were 68K. My personal experience was that once I switched to PPC, running the same software on 68K felt slow by comparison.
Apple will want to phase that out as quickly as is acceptable to the public, and just like the PPC to x86 transition app developers will probably do it quicker than apple itself. So even if the OS might be updated for a while I think we'll pretty quickly see some apps that just won't run.