Re: Regardless of which side of the fence you are on.
I kind of see what you mean, but the very purpose of courts is to interpret the law.
In particular, the purpose of a constitutional court - as the SC is permitted to act - is to interpret the constitution. Having an unwritten constitution offers them considerable latitude limited only by prior precedent and custom.
If parliament wishes to strike down the precedent they merely have to pass legislation that invalidates it.