Given that imgur seems to be accesible again (for the time being at least) but for the images that now or in future are no longer accessible I think using Option #2 would be a way to simply get it over and done with and let the past be the past.
Nope it's not working... it was working for some time but it's down again for last few days.
As per the current poll stats 54.3% votes already opted for option 2.
But like someone pointed earlier we also have to think which one hurts more in terms of SEO and user experience broken image or broken link?