> even as little as 50%

Depending on how you measure that velocity (e.g. including security risks, debugging capabilities, ...) even as little as 5% increase is a no brainer for a business. Whether it's AI, powerful laptops, a fully-fledged IDE, an environment with a good dev experience, anything that gives a few percent increase snowballs into millions over an entire workforce.

Whether the current AI capabilities provide that increase without trade-offs that would be too heavy later one is a question that still seems up to debate.