Sim
Essas pessoas em esta referência interpretam a cena final do Graal da mesma forma que eu faça:
O Graal está perdido para sempre . (negrito meu)
Elsa grabs it and runs off, but when she crosses a forbidden area, the temple collapses, and Elsa and the Grail are lost forever.
O site da Wikia para Indiania Jones diz isso sobre o Santo Graal (mina em negrito):
Indiana nearly tumbled into the abyss himself, but was caught by his father. Indiana, like Elsa, tried to reach the cup, but was persuaded by Henry to let it go.
As a result, the Grail was ultimately lost following the events of the adventure, but the experience gave both Indiana and his father the chance to rekindle their rocky relationship.
Além disso, essa página menciona:
Years later, the elder Jones remarked on the elusive, indefinite nature of the Grail, commenting that the cup discovered by the father-son team was simply "a Grail. But many of the oldest Grail texts, written by the most ancient seers, refer to the Grail as an elixir, as a bread, a powder, gold, or a stone."