As alluded to in the article, we could go on at great length about what went wrong, how it could have been different and all. There's no doubt that there was many a lost opportunity.
The author said that Acorn was 'one step behind' I've never been particularly wealthy and was always a few steps behind. When the RiscPC was popular I had an A3010. When the Omega was to be the next big thing, I got a RiscPC 600. I still have that with an arm 710 in it. I would love an Iyonix or an a9... It won't be this year though.
That there are still versions of RISC OS and compatible machines being produced ten years on is a testament to Acorn's legacy. When you factor in the success of ARM, it's frankly amazing!