Edit: From Wikipedia:
During his keynote speech at the Macworld Expo on January 9, 2007, Jobs announced that Apple Computer, Inc. would thereafter be known as "Apple Inc.", because the company had shifted its emphasis from computers to consumer electronics.[93][94] This event also saw the announcement of the iPhone and the Apple TV.
Still, I think there are two arguments:
They are sitting on so much cash. There is obviously a cultural or organizational problem that produces to much friction to keep this product line up to date. I'm fairly certain many other corporations, if provided access to basically infinite cash, could figure out how to put new ram in an existing product line every year.
There's huge value in having creative professionals and developers use your product. Keeping people in your ecosystem is important. This might be hard to quantify on the bottom line, but it seems like an obvious strategic mistake to give up this advantage.
What if the ecosystem they want is iPads and iPhones?
You saying this doesn't make it true. To a neutral observer, Apple looks like a technology company that makes consumer products, including sometimes computers.