You're asking TWO questions not one. I THOUGHT sun and Dec wouldn't disappear into other companies. I'm still really cross about Dec. I learned on a dec10 and operated 11 and 11/780 systems as well as decstations.
I THINK that a lot of sw dev tooling companies will get folded in. Atlassian for instance.
Intel isn't as strong as it needs to be but US govt support will probably keep it there.
I thought Borland was unstoppable, until they lost focus, and started chasing Microsoft instead of leading the field. Turbo Pascal was magic - compile times so short the program was running just after you hit F9. Compare that to an hour waiting for your program to compile in the queue on the VAX 11/780 in college.
Palm, Inc. Man those little devices were cool for their time. Not sure what happened. How did the shareholders agree to sell to HP? Did they really think HP stock was more valuable? Anyway, hindsight is 20/20.