What speed of internet connection will be enough for rendering? Maybe it is much profitable then mining but I think there will be no work for loading hardware for 24/7.
I built a render farm about a decade ago and it ran 24/7 365 a year. It was a large company though. Could totally see this being profitable but more profitable then mining I have my doubts.
It always depends on the current stage of the crypto market. Its too volatile to foresee this at current date I think.