But the Boxster didn't try to replace the 911 on day one. Or even go after the other 300ZX/Supra/whatever 2+2s on day one. It was instead nearly a whole-cloth "what if pure 2-seater convertible driver's car, but the best possible version" upscale-Miata initially, which wasn't an existing segment at all, and being roadster-first was a key separator from the also-2-seater Corvette.
(The iPhone or iPad were arguable Apple's Boxster "entry-level that ends up dominating sales and growing into full blown new product lines" anyway, except that the comparison eventually falls down because the form factor difference with the Mac is much more of a fundamental separation. So maybe Apple's Boxster is instead the laptop in the first place, which wiped out most of their desktop workstation business by the early-2010s at latest.)