Agreed wholeheartedly that post limits need to be applied to mitigate drowning the good content out with superfluous crap.
Don't be so sure on the ETH dump. It's early days and only takes a few Whales make a massive change in price for their own advantage (which us tiny fish can capitalise on in you can react fast enough).
Bitcoin is digital gold and will always be around. Another comparison in opposition to "like IBM in the era of Apple Computer" is...
"It's like Lego in the era of ipads. People still keep buying and building it". It'll stand the test of time for sure :)