Yep, this is the harsh reality.
I actually think Kronner has made a very smooth transition into the #1 spot. He still makes those stupid, lazy mistakes now and then, but, for the most part, he's owning his role. He's become one of the best defensemen in the league, and by all accounts he's a great veteran leader. We're very lucky to have him.
I'm perfectly happy with Ericsson and DeKeyser. It's just - to beat the dead horse - that hole in the top four. In a perfect world (to beat another dead horse here), we make a strong addition in the summer through free agency. There are some very appealing names on the list, though I expect pretty much all of them to re-sign.
I think the Wings have a couple of guys in the system capable of filling that #4 spot, but they won't be ready for the job for a few years. IMO, this is why Holland seems unwilling to part with prospects for a top D-man in a trade. It's hard, but as fans we're probably just going to have to be patient and the roster will work itself out. Not this season, but I'm thinking 2 years from now.
Edit: Sorry if this post is off-topic. Ericsson's contract actually seems below market value for a top 4 defenseman.