What are you talking about not needing room temperature superconductors for room temperature operation?
If at 300 K a material has zero resistance then that material will carry current at room temperature.
If at 300 K a material has zero resistance then that material will carry current at room temperature.
There are some neat applications of this phenomenon in superconducting electronics. Cryotrons use transformers to produce large fields from small currents to switch a higher-current-capacity line from superconducting to normal. N-trons and other "current crowding" devices perform a similar trick using currents in a pinched region attached to the high current line. I can't remember the precise details, but different superconducting films are more or less inclined to "localize" the normal-phase region induced by local current/heat.
Sadly, those neat devices are apparently quite finnicky because switching emits heat into their environment, and also depends on temperature of that same environment. As far as I know, cryotrons are used for high power electromagnets to rapidly and safely dump the energy -- they don't appear to be useful for superconducting computers, for example.