Newtek, they supported the Amiga years after its production ended with hardware like The video Toaster/flyer and groundbreaking software like Lightwave 3D. They are still in business selling PC based video editing hardware and software including Lightwave 3D. They dont get nearly as much credit as they should. They even did repairs to video toaster hardware for no cost till about 5 years ago when they finally ran out of parts.
Not to mention they released the source code for the original Toaster software, how many other tech companies do you see doing that? Personally I think it should happen far more often, both for historical reasons, and to allow continued development of long-dead products. I would like to see schematics and firmware for any microcontrollers, ROMs, PLDs, etc released for any hardware device that is discontinued as well to allow it to be repaired.
As for the computer industry in general, computers were new and exciting back in the days of the Amiga. Technology was evolving at a breakneck pace. Computers were never quite powerful enough for what you wanted to do, a computer that was a year old was getting obsolete, 2-3 years old and it was so far behind that it was practically useless. Today things have matured, general purpose PC's are so powerful that the available computing power has vastly outstripped the needs of the average user. Case in point, until a couple years ago I was using a nearly 10 year old desktop as my primary PC and it was perfectly adequate for most of what I needed, I was using it for PCB CAD and even some light FPGA development and it did alright. The main reason I upgraded was so that I could do video transcoding and I plan to use the i7 I have now for 10+ years. Software used to improve constantly with each version adding new capabilities and improved features. These days whenever I update to a new version it's more like ok what useful features did they take out, what new bugs does it have and where did they move everything around to? I no longer look forward to new versions and rarely upgrade at all until forced. The whole industry is mature and the magic is gone. The personal computer has reached ubiquitous commodity status.