Re: another closed system with no upgrade path
John Hennessy founded MIPS.
David Patterson created the Berkely RISC processor that became SPARC, (RAID) and now the RISC-V CPU.
As long-term collaborators, they have the seminal textbook on CPUs: Computer Organization and Design MIPS Edition: The Hardware/Software Interface.
Perhaps Hennessy's creation has realised that its own v2 is the RISC-V, hence dumping the v1 stuff.