This is an interesting debate that hasn't been fully explored. Much like my previous post, I would say that parliamentary supremacy rules, and the Supreme Court does not have the authority to strike down a constitutional amendment as unconstitutional.
You may be interested to know that a similar issue was recently (past 10 or 15 years) litigated in Nevada over school funding, I believe. That situation was slightly different because there the Court found that two separate provisions of the Nevada Constitution were contradictory, and eventually, as I recall, held part of the Nevada constitution unconstitutional.
-PJ