SEO is still a high-ROI investment for most Canadian businesses in 2026, but the playbook that worked in 2022 doesn't work the same way in 2026. AI Overviews have changed the economics of certain query types — primarily informational queries — while leaving the economics of commercial-intent queries largely intact. Adapting to these shifts is essential; abandoning SEO would mean ceding a still-dominant discovery channel to competitors who haven't. The data on actual impact: across our Canadian client portfolios, the businesses most affected by AI Overview rollout are content publishers monetizing through display ads — informational query clicks drove their revenue model and AIO has absorbed 30–60% of those clicks. The businesses least affected are service businesses and B2B companies — their revenue depends on commercial-intent queries where AIO impact is 5–15%, often offset by AIO citation visibility. The modern SEO playbook for Canadian businesses in 2026: (1) Shift content investment toward middle and bottom-funnel topics where AIO impact is lower and conversion intent is higher; (2) Pursue AIO citation share aggressively for informational topics you do publish — being cited generates brand exposure that offsets some lost click-through; (3) Invest in E-E-A-T signals (named expert authors, original research, schema-marked Person profiles, sameAs links to verified profiles) — these correlate strongly with AIO citation eligibility; (4) Optimize content structure for extraction (lists, tables, definitions, FAQ schema) — both AI engines and Google's organic algorithm reward this; (5) Diversify discovery channels (newsletter, podcast, community) so you're not entirely dependent on Google-mediated traffic. What hasn't changed: the fundamentals of technical SEO, content quality, backlink acquisition, and topical authority still drive both organic ranking and AI citation eligibility. Pages that rank well organically are dramatically more likely to be cited in AI Overviews. The work that earns organic rankings is largely the same work that earns AIO citations. What has changed: keyword volume is no longer the primary success metric for informational topics — citation share and brand mention frequency in AI surfaces matter more. Click-through rate optimization for informational queries is less leverage-able. Content programs entirely focused on top-of-funnel traffic capture are increasingly disadvantaged vs. programs balanced across the funnel. The Canadian-specific opportunity: many Canadian businesses are still operating on 2022-era SEO playbooks (heavy informational content production, vanity-metric reporting, no AIO optimization). The competitive bar for adapted SEO programs is genuinely lower than it was three years ago — businesses that update their approach gain competitive advantage faster. The businesses that should invest more in SEO in 2026 than they did in 2022: B2B companies with considered purchase journeys; service businesses where customers research before contacting; specialty Canadian businesses competing against US-based generalists (Canadian context creates defensible content moats); and any business whose paid acquisition costs have risen faster than their lifetime customer value.