I'm convinced it will be a fad! It's a poor version of a tamogotchi which was once the 'in' thing, they tried to re-release it not too long ago and it bummed out. Once people get past the hype, they wont want to be playing a 90s game where every movement is a microtransaction.
It's really highlighted how vulnerable Ethereum is though and I'm sure those who have recently been saying BTC will burst and Ether will be the future king have gone back under their rocks.
Ultimately blockchain isnt designed for games but the scalability really isnt there at current times ... interesting times ahead
Look, personally I'm not against the microtransactions, but only MICRO
If cryptokittens were created on some blockchain with really FIXED MICRO fees (like 1 cent or smaller) — they would be a great game!
But paying 5-8 bucks for every action.. come on guys, this is not funny at all.
I can't pay such price for stupid game, it's ridiculous.
Anyway, despite on Ethereum network issues last weeks I still think that kitties is a great case for all the world. It shows the great idea based on a poor fundament.
It reveals many problems of Ethereum and cryptocurrencies in general.
Hope Vitalik and the team could do something about this. 
