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A reminder in the age of the Fediverse: if you're not the customer, you're still the product.
(slrpnk.net)
OP was taking about Tumblr, but I think it applies even more to the Fediverse: users need to develop an ethos of paying to support the sites they use. Otherwise advertisers pay the bills and call the shots.
Passion projects still cost bandwidth, if not hosting fees.
Also, major news and media sites are not going anywhere. Little passion project sites will not replace a platform like YouTube. Serving video is expensive.
Have you heard of pied piper?
From the silicon valley show
They did exactly what you described
That would be the case already, if we were all still watching stuff in 480p. As tech improves, so do the demands.
Probably no time soon.