Why would diamonds not exist just because of a readily available superconductor?
A readily avail organic room temperature super conductor being discovered is such a huge thing that it would impact us today in almost unimaginable ways. Something like that being discovered early enough would have drastically changed how we developed technologically.
Put in another perspective is the US rural electrification project long ago. At the time it meant installing poles all over with huge economic results both in paying people to do it and them having things like electric lighting. Also however is the fact that it was pretty difficult to transmit power more than about 2 miles.
We have since learned a lot of things to improve the range of how far we can pipe electricity from a power plant, but it comes at the cost of things like high voltage wire runs and electrical switching stations all over. That 2ish mile range rdsulylted in lots of tiny power plants in little towns all over. With that superconductor it could be a bunch of windmills spread over tens of miles or more without the 2ish mile problem.