CTOs face a critical choice in 2026: replace legacy ERP systems entirely or add an intelligence layer? While full rip-and-replace offers clean architecture, it carries high risk—75% of implementations fail. The intelligence layer approach keeps stable legacy ERPs as transaction engines while adding modern interfaces, automation, and insights on top. Recent data shows enterprise AI adoption is accelerating, with one provider capturing 40% market share by late 2025, yet 95% of enterprises still struggle to see meaningful ROI.

The key is matching strategy to circumstance. Use a scoring framework weighing ERP stability (25%), API availability (20%), business model change (15%), time pressure (15%), risk tolerance (10%), budget (10%), and support status (5%). Scores above 70 favor layer approaches; below 30 suggests replacement.

A 90-day plan—discovery, proof-of-concept, decision—provides a practical path forward. Success depends on objective assessment, not vendor incentives or industry hype.