So far, patent lawsuits have been more of a problem for those using ARM designs (Qualcomm) than those using RISC-V designs. The Raspberry Pi foundation, Western Digital and Nvidia have successfully put RISC-V designs into their products without any issues. The first two even made their core designs open source (see Hazard3 and SweRV).
My point is that if RISC-V takes off people will struggle to do decent implementations of it without stepping on the toes of the people already in the area.
I'd go so far as to say this is the entire SiFive strategy.
RISC-V already has taken off. There are billions of RISC-V cores shipped in consumer products every year. Adoption outside of the embedded MCU space is slower, but that is natural. Your FUD about SiFive is absurd. Hardware patents related to CPU design are typically ISA independent.
SuperH is owned by Hitachi. You cannot use them without a license from Hitachi as far as I know. RISC-V is unique in that its creator permits anyone to make and use RISC-V cores royalty free. It also supports 64-bit, which SuperH never did.
In any case, you should probably stop writing before you shove your foot any deeper into your mouth.