TBH, I'm fine either way.
The paywall is not that restrictive (i.e. not that expensive) and it supports the forum.
The people who posts have more quality. They don't just post a thread and vanishes into thin air. haha.
But then again, this is coming from a long time C4D user. Not the incoming ones.
So my sentiment could totally be invalid.
Anyhow, if there is a change, you could still limit it. Like only limited number of visits per month for free users.
Not really sure since I don't have stats on how much non register users visit the site.