Wikidot Community

You mean your account and not site alone..
Yes, there was a post or blog entry from Michal some years ago what happen if an ACCOUNT is not prolonged as pro…

falling back to free account and all the sites are frozen - if bigger than free limit., if not than like free sites.
There is no answer from Wikidot on questions about such issues.

I would prepare me to finish all activities as pro account and later search for other wiki services.to transfer my wikis.

On the FAQ:Upgrades page ( http://www.wikidot.com/faq:upgrades ) I found this paragraph:

What happens when my subscriptions expire?

When your Pro subscription expires, your account and all your Sites will be downgraded to the free version. All the extra features will be downgraded. E.g. SSL will stop working, advanced web statistics will not be accessible anymore, your forum signature will be no longer displayed. No content however will be deleted upon downgrade and all the settings you had will be kept. Once you renew your Pro subscription, all features will be restored instantly.

Number of slots decreases when either your Pro subscription expires or when your slot upgrades expire. When number of slots drops it might happen that the number of your Sites is larger than the number of your slots. In such a case the most recent Sites will be locked (read-only) until you prolong your subscription.

If your file storage exceeds your limit after the downgrade, you will not be able to upload new files.

I hope this helps?