Well reading the article and the comments it looks as if Feedlounge is a subscription based online RSS reader. Hmmm with the number of free alternatives if looks as if they were going to have a hard time in the first place. I don't think it's fair to put the blame solely on 37 Signals for their demise.
These guys were offering a paid for RSS reader. There are like 400 free ones out there already.
37Signals suggests people charge for software yes, but the don't say that you can simply sell anything your heart desires! If people aren't willing to pay for it, perhaps there isn't a market for it, and perhaps it's not a good idea for a business. (At least as a pay-per-use model)
When a company has millions of users among their other services, and they decide to cut one to focus on the others, I don't think that's failure at all.