Im a little worried about the... validity of the trade system. if it is *only* random events creating trade opportunities, there is a large problem. Additionally, some profit should be possible even without these events, so you have something to scrounge if you really need to.
What i mean is, all these fleets of traders roaming around, if a certain station has a pirate infestation at a certain point in its orbit maybe, that prevents any traders from getting to that station, during that period prices should rise due to lack of traders visiting and prices could go up.
I agree with the assessment that from your blog post, it sounds like trading will be nothing more than a thing you get a popup quest for every now and then and do, rather than a real profession that makes buying an atlas fleet worth it. It could just be from the blog's presentation rather than your actual intentions though.
Edit: additionally, if im not a trader getting trader event popups could get very annoying. it did in evochron mercenary and that was only for distress calls.
Was just looking through the comments and realized I totally missed this one; sorry about that!
I'm not sure why trade being event based would be a problem; you're saying it's because you need to be able to scrounge something up if you need to but... why is *that* necessary? In a nutshell, I see making money from standard trade as a bad thing because it encourages safe, boring trade runs. You might say that responding to an event isn't any better, but the difference (hopefully) is that you can do more interesting things to set yourself up to respond to an event effectively (such as, say, cultivating connections to get the information early, or even acting to create the necessary conditions for an event to occur), and then the actual "trade run" is the culmination of that work and planning, rather than being the actual work.
An Atlas fleet might be just the sort of thing you can use to really cash in on an event you took pains to predict/cause, while a faster fleet might be able to be more reactive, but wouldn't have the cargo space to really capitalize.
As far as the UI, popups would indeed be annoying. The idea is that you get messages (in the lower left corner, that widget is being reworked), and you can click on them to get additional information if you're interested. Otherwise, they can just be ignored.