I would very much be against this. I try to follow every post on the IE and if there was a bunch of ideas which all appeared together it would simply flood me at that point in time instead of allowing me to go at my own pace.
I would agree that the problem is probably because people don't follow the exchange, but the solution to that might be to make it more accessible.
For example, the IE has an RSS feed for ideas, just like Shaun asked for - http://forums.ni.com...id=labviewideas
The problem is that if you don't look for it, you don't know it's there. The site doesn't seem to make it accessible enough. Ideally, it should provide people with several ways of getting alerts to either ideas or comments.
In any case, I think that people have to make a conscious choice to follow the exchange or they will have to rely as filters such as this thread to point them to specific ideas.