The experiment will likely fail if it the network is NOT upgraded and the limit eventually removed.
Nonsense.
Bitcoin does not "fail." It gains strength when,
and only when, faced with adversity.
In this case, economic and social pressure from full blocks will force ad hoc (offchain) and per se (technical) optimizations, as well as the required consensus/political courage to implement those big scary changes.
I find your lack of faith disturbing.