It's Christmas so most of the traders probably aren't active.They won't be that active during the holidays,I guess.
Anyways,moving more BTC to cold wallets is a good sign,unless the US government decides to ban cold wallets(or creates some kind of KYC for cold wallet owners),which is very unlikely to happen.
I'm not sure about Coinbase letting lots of people and companies buy BTC using their platforms and moving that BTC outside the Coinbase wallets.I assume that Coinbase makes money from the buying fees,but they are greedy,so they might impose new rules to force their users to keep more BTC inside their Coinbase wallets.
The opinion formed of a quiet market seem not to be the same, Bitcoin made a new ATH today, when I compare the most part of the year, nothing looks different from the present holiday, this is internet, things cant be too quiet because of holiday any more. What is Coinbase etc benefit from restricting withdrawal after they got their transaction fee?