Nothing is a copout if you explain it well. AI is a good start, however do you think there's a risk of others choosing the same topic? If so, do you think you're able to write a strong enough answer to set yourself apart from theirs? It's a little risky - you want to stand out, not blend in. So, I personally would not choose AI as a topic. Instead, think beyond disruption to the wider industry and something specific to the firm itself, its particular industries/key clients/something they've been doing well. Everytime I was faced with this question, I always considered their annual report first to read through any of its successes, weaknesses, areas of focus for the foreseeable and used that as a base to identify potential risks.