The old game manual still applies because a correlation does not prove direct causality, especially in complex legislation matters. The decline in investments is a circumstance, not the sole driver of such a significant government action.
Historically, policies of this scale are the result of prolonged debates and strategic visions, not an impulsive reaction to a conjunctural data.
For example, the introduction of quotas for local content in France in the 1980s was part of a long-standing cultural policy, well before a sectoral decline became evident.
One should be wary of the idea that the decline in investments alone would have triggered such a profound initiative.