Given that the url collection project (can’t think of the name) that inspired this approach went under, maybe it’s not too much of a surprise if it doesn’t take off here either.
The problem is that for most people the process of adding new items is too arduous. Also, the fact that you can’t just have Links collect it from your already existing TiddlyHost file means you have to have a dedicated TW file just for favorite links. The theory there is that it would put too much load on the server if the links were part of general-use files. My feeling is that the loading process is so fast, and the updates so few, that it wouldn’t actually be a difficulty. Like most people will only update their personal, public TW’s once a week or so. So even though the individual load might be a bit much (by bit much, I mean more than 1 second), it happens so seldom that it doesn’t matter. So, maybe deal with the load problem further down the road if becomes a problem. Right now the problem is the opposite – lack of uptake.