Regardless, most of my hardware is still better off using 32 bit ATM, so I am definitely glad this guy was shot down.
But for an OS like Linux? No reason to force the issue. Totally different user base.
SPARC is not old architecture it is present.
There is Ultrasparc T2 CPU that is GLP'ed for Microprocessor definition
and is free to develop, manufacture adn enhance in open.: www.opensparc.net
As there are old - x86 CPUs, there is also old SPRCs but that does not say whole architecture is old or something.
It evolves and is being developed further, same for x86 ,SPARC and POWER.