The Vertical AI Land Grab: How Industry-Specific Agents Are Devouring Horizontal SaaS in 2026
47% of top U.S. enterprises have moved a workflow from horizontal SaaS to a vertical AI agent, Harvey hit $190M ARR in 13 months, and Sierra crossed $100M ARR in 7 quarters. Inside the $135B-$180B reallocation reshaping enterprise software in 2026.