Lasers still can cause potentially blinding unwanted reflections. Still likely a better option than supersonic shrapnel from standard proximity fuzed rounds though as collateral damage goes.
Yes lasers are not perfect either, for example the chances are often fairly high that a shot-down drone will fall onto something (or someone). Like I mentioned before, if drone swarm attacks are a part of the threat model then you might want to reconsider if you want to let civilians near the event at all.
