According to the PMBOK® Guide, specifically regarding the Project Manager ' s Role and Project Integration Management, issues involving the project’s continued viability are business-level concerns.
Business Value and Viability: The project manager is responsible for delivering the project ' s outputs, but the Project Sponsor is the owner of the Business Case. When a competitor releases a product that potentially makes the current project redundant, it threatens the project ' s strategic alignment and expected return on investment (ROI).
The Role of the Sponsor: Because the sponsor provides the financial resources and is accountable for the project’s business benefits, they are the only ones with the authority to decide whether to continue, pivot, or terminate the project based on the new market reality.
Escalation: This is not a technical project issue that can be handled via a standard change request or risk mitigation plan within the project ' s boundaries. It is a high-level strategic risk that must be escalated immediately so the organization can perform a cost-benefit analysis of finishing the project versus stopping it.
Analysis of other options:
Initiate change control (Option A): Change control is used for modifications to the project scope, schedule, or budget. It is not the appropriate mechanism for deciding the existential fate of a project due to external market shifts.
Address risk mitigation (Option B): Mitigation is done to reduce the impact of a risk. Once the competitor has already released the product, the threat has realized into an issue. You cannot " mitigate " the fact that a competitor ' s product now exists; you must decide if your product still has value.
Initiate project closure (Option D): A project manager does not have the authority to unilaterally close a project because of a competitor ' s move. Closure only happens after the sponsor or a steering committee formally decides to terminate the project.
Per PMI standards, the project manager must ensure the project remains aligned with organizational goals. When an external event significantly alters the business value, the Project Sponsor must be engaged to re-evaluate the project ' s justification.