Transistors are semiconductor switches. So no, that’s not how superconductors work. Superconductors use a Josephson Junction.
Semiconductors get hot and break down if you run them too fast, they age. RTSC’s do not have these limits.
We wont use LK-99, we will probably find a dozen RTSC’s by xmas. People are already looking past LK-99 for better ones.