Didn't someone mention the stolen/missing Mintpal and Cryptsy coins were being dumped for a whole year, suppressing the Dash price?

Considering what the team and community have built, there is no reason why the Dash market-cap cannot continue increasing from here.

The main issue is that when someone decides to take down their Masternode, they are likely to quickly dump it into the current market buy orders (which can be a bit thin at times).

Has the team considered adding a delay, so that Masternode coins are not spendable for a certain amount of time (~24-48 hrs) after a Masternode is taken offline?

A delay could give the market time to prepare while additional coins move to the currency market, and could add stability as it creates another level of separation from the Dash reserve market.