I don't think its a knee-jerk reaction based off the last two games. The Wings have blown 11 third period leads over the course of the season so far. Our win percentage when leading after 2 periods is .625, which is second worst in the league, and that isn't trending up.
And I do think it's knee jerk considering this thread, and most of the opinions herein, didn't spring up while we were regularly beating good teams. Nobody was rushing around to talk about all the changes we needed to make when we were busy beating Montreal in regulation. But lose two games and here we go. Look back through the GDT's and see how many people were saying "I know we're scoring goals, winning games, and even getting points in our loses...but dammit we need roster changes".
But I'll give you one thing. Our win percentage when leading after two periods IS low. So low, in fact, that I'd argue its an anomaly. So low that its almost a freak thing. So low that MUCH worse rosters aren't even comparably bad. And as such, it's probably not something a roster change is going to fix.
THIS is a mental thing. And probably a usage thing as well. Changing around bodies for depth players, who probably aren't going to be on the ice late in games anyway, isn't going to address the issue.