[fogof]

Well I guess it depends on the current price of gas. I was playing around with ENS on Ropsten and I estimated it takes about 1/2 a million gas to buy an ENS domain. At current gas prices that's ~$30USD, but this time last year it would have been around $5. With the per year cost of the domain being $5 on ENS and About $12 on most of the registrars I looked at, it would have been better to go the ENS route (setting aside the gas cost of regularly updating the site, which I guess could also be avoided using IPNS, though it wasn't mentioned in the blog post so I am not sure about this).

[lalaland1125]

One big issue here is scalability. If enough people start using ENS that gas price will go up significantly. Ethereum is fundamentally not scalable.

[mattdesl]

Not at present; sharding (part of Eth2) will change this scalability dramatically though.