If I understand you correctly, the ability to be conceptually falsified is a requirement for scientific theory in general, including evolution theory.
Absolutely. This is why explanatory frameworks which no conceivable observation or experimental result can ever falsify are deemed to not be scientific theories.
In anticipation of the obvious (and perfectly legitimate) follow-up question, I will point out that there are probably an enormous number of observations that would falsify the Theory of Evolution; I'll just mention the most well-known one: irrefuteable evidence of Human existence in the Precambrian. That would upset Darwin's apple-cart.