Would it be better to penalize those who actually mint with <4.0 and never switched to 4.0 within a given time frame, rather than those that don’t mine with 4.0? I worry about those who only have a small amount of BKS (like up to ~20 BKS), who by chance might not get a block in a long period of time. It’ll benefit non-minters, but the purpose is to get the message across.
I’ll support an other 1-month time frame for waiting, after warnings are publicized at certain selected venues. We might also need a clause that this plan is void if we can update to 4.0 on time, which will likely be better for PR.