What % of the TNS postings do we imagine we see? If all we got per sector was roughly what we'd see in the collected postings over years in the Marches even if you cover 1105-1130 would certainly not take much space to move along. However, if the amount of releases is assumed to be thousands or more times larger, maybe more of an issue.
The real issue with 'Imperium Wide' is that X-boats moving at an average of around Jump 3.5 or so, would take about 2.5 months to cross sectors widthwise and maybe 3 months lengthwise. So to cross the Imperium from the Marches to the far other side or hang a dogleg and head down to the Solomani Rim seems like it would take several years. I'm not sure how much use piles of vastly dated snippets (not full articles) of places you've never heard of having things years in the past and context dependent to the region will be.
It might be useful for some academics or as you say, people with too many time units on their hands.... but for the most part, you wouldn't see them in the normal feed that shows up at a starport far beyond the source I would think.