And the SSL were only used as an example of something that works “forever” independent of whatever happens (unless the world explodes 
)
How many/much software dependent hardware (or hardware dependent software) audio gear have been abandoned, discontinued or otherwise left behind throughout the history?
Plenty (Steinberg among the worst hardware wise).
From an economical point of view, it is perfectly fine to think ahead. And act sensible. Isn’t it?
And please don’t worry about my electrical bill