That is my main issue with the way IPFS is being marketed, as it were.
It is not a "Permanent Web" if the only content that is permanent is popular content. Old links will still break, because old links are generally less popular. Old websites will simply vanish, even ones that are otherwise maintained on the current web.
In particular, applications like this post itself, that are part backup part publishing, aren't great applications of IPFS because your images are just hosted off your home internet connection. Power outage? No data. ISP issue? No data. Hardware failure? Hope you had a real backup. Basically, why would I choose IPFS, which is in this case equivalent to self hosting, over flickr, instagram, etc?
Edit: I'd be remiss to not refer you to toomuchtodo's comment below. Were a service like the Internet Archive to take part in IPFS then it would help with some of my above concerns. However, it's not really IPFS that is making the permanence possible so much as the Internet Archive in that circumstance.