Source
David Senra — How to Win Deals & Grow a $250B Business | Nikesh Arora, Palo Alto Networks (November 8, 2026) ·
at 54:48 ▸
When this applies
when assessing whether a new general-purpose technology can substitute for an incumbent's specific service, by checking unit economics, not just capability
The takeaway
A technology that's capable of doing a task isn't automatically a substitute if its cost structure doesn't fit the task's volume/frequency profile.
Why it works
AI increases the speed of finding vulnerabilities for both attackers and defenders, but AI's token-based cost structure makes it uneconomical to perform continuous, zero-marginal-cost inspection at endpoint scale, whereas the incumbent's model (flat fee, near-zero marginal cost) remains structurally cheaper for that specific function.
One level up
Assess competitive threats from new technology by comparing unit economics and cost structure fit, not just raw capability.
Where it stops holding
This stops working if AI inference costs fall dramatically, removing the cost-structure moat that currently protects the incumbent's continuous-inspection business model.
Detail
rule: Break cybersecurity into: (1) ~50% perimeter defense, (2) ~10-20% internal hygiene/analytics, (3) ~20-30% detection-and-ejection once breached; evaluate AI's substitution threat separately for each.
threshold: Endpoint inspection at ~$25/year vs. AI-token-based inspection estimated at ~$50-500+/day for equivalent traffic volume
rationale: AI can find vulnerabilities faster but can't patch them itself economically at the needed scale/frequency, so the virtual-patching service remains necessary and valuable.
In their words
The marginal cost of inspection of traffic in laptop by me is zero. I don't charge you more the more traffic that goes through. AI is set up to charge you every time you run traffic through AI in terms of tokens.