I prefer to call that a feature, not a problem. I think it's a pretty good and innovative feature of the game that enables me to avoid the pitfalls of multiplayer (idiots, griefers etc), while at the same time enjoying multiplayer when I can.
I wouldn't change it one bit if I were FD.
EDIT: My armchair developer comment was more directed at the forum as a whole (look at some of the posts regarding the Diamondback for example). I certainly do think the idea to penalize players for wanting to play single player is a terrible idea though. Especially when you consider the backlash against the no-offline mode. If FD want to see almost their entire old-time userbase turn hostile they should do just that.
Your "speaking of which" comment and then adding my quote was most certainly not. Though on the interwebs I take any level of apology I can get.
Right now though, you are right though. It would hurt the user base because certain decisions cannot be remade once people have invested hours into getting used to the mechanics.
However, instead of penalizing solo, FD have successfully buffed Open through trade dividends and shared bounties. I hope they will take it to the next level with future iterations of CGs and make them fun to do in Open also.