It will definitely create an influx of newbie accounts. I do not think that this is the cure-all solution, my solution would be IP banning if that is possible. Most games that I play do this when they detect cheaters in their game, it is pretty effective because the rate of cheater drastically gone down. Although in this case, it will be different, I do not know much about the administrative functions in this forum so I do not know if it is entirely possible at all.

Q: Why is my IP banned? What are those units of evil?
A: Your IP might be banned because it was used by a user that got perma banned. Don't worry - IP bans decay over time if there's not too many of them during a small period. If you register using a banned IP, are using TOR, VPNs or well known proxies, you will have to pay a small fee. This is to prevent spammers while allowing legitimate members to post without many restrictions.