I don't store most of my Bitcoins in an exchange so I don't have to participate in the event. If the exchange that i'm currently using doesn't have minimum withdrawals I could move all of my dusts to my wallet and join the movement.
No, and i think its realy absurd becouse in that situation all centralised exchanges wouldnt be exist at all, i dont think its good idea at all we needt this ,its my opinion.
It's also not a good idea to use exchanges for storing Bitcoins. This event is just optional no one's forcing you to join.
Imagine that most of them start to download desktop wallets which are free to use, number of users who would lose their coins due fake wallets, malware, transaction to wrong address/chain would probably be significant. This means that the damage would be greater than the potential benefit from this event.
The damage could be greater but it's unlikely that most of them will lose their coins once it's stored on a wallet where they have their private keys. Better safe than sorry.