AI is changing lead generation for professional services firms at the top and middle of the funnel, not the close. It reshapes how buyers discover firms (asking ChatGPT and Perplexity before they Google), how firms research and personalize outreach, and how fast an enquiry gets a useful reply. What it does not replace is the trust and judgment that turn a qualified conversation into a signed engagement. The firms that win treat AI as an accelerant for qualified pipeline, not a volume machine.