Personally, I've never been worried by the 8 year battery replacement thing. I've seen some research on Tesla which suggests that their batteries are not losing performance at the rate that was initially expected. The same applied to the Nissan Leaf although to a lesser extent, I believe Tesla has good battery management software. Even at 80% capacity there's still a use for them as city cars for years, if the public can be persuaded to buy them that is.
I don't believe they're any more a fire risk than petrol or diesel, that's just media hype but if one does catch fire then they're clearly more difficult to extinguish.
In terms of running costs, EVs may be cheaper in some circumstances, but £0 VED isn't going to last, nor is the 0 BiK.
EVs seem to share a similarity to Smart Meters, the majority don't seem to want them but those that choose to have them love them.