I've heard this hypothetical point brought up in response a lot but see no reason to even take it seriously.
Many tokens with no staking mechanism at all have gone up many times over in a matter of days. Are there then some selling? Yes, sure. But that didn't stop them from still growing to become top market cap tokens.
The solution is to keep adding more reasons for people to want to buy HIVE and/or to stay vested. Not to do whatever to make it harder to sell.
So what was the thinking behind 13 weeks and 104 weeks before it? I don't claim to understand all the economics. I have concerns that we would see more people dump earnings rather than keep them staked.
I don't think that's a reasonable concern. The problem isn't people selling. The problem is people wanting to sell.
Flip it around: If you have people who want to sell their HIVE but can't, do you believe they are going to be good participants in governance or curation? If they want to sell, the problem has already occurred imo.
We each have our own motivations. Have to make Hive a platform people want to keep a stake in. Not always easy, but worth trying.