I suggest that it is best not to over-react in any way to the extent that the spammers succeed.

Like when perfectly good music threads are closed on our forum because spam is sent to them. That is over-reaction.

Most of us do not stop visiting attractive parts of our countryside because there are a few flies buzzing around our heads. And closing down entry to one part - will not solve the problem - it will just be an unecessary restriction.

Picnics and BBQs would be better without the flies in the same way as the internet and our forum would be better without spam - but the trick is not to allow these small irritations to spoil our enjoyment.

This is not to minimise in any way the huge problem that spam represents - just suggesting that we take a proportionate response to seeing the symptoms (and the occasions when they can't be avoided).