He's probably been on the phone, a lot. Maybe most teams are waiting until closer to the deadline. Maybe they are asking for too much. Maybe Bloom's higher priority is the longer term, and with so many roster spots opening up, this winter, he's looking to keep as many of our best prospects as possible. Likely, it's a little of all of this.
I'm not against trading prospects, even good ones, and neither is Bloom. The "now" part of your point is valid. We can't afford to lose games vs top opponents, but with Whitlock, Sale, Eovaldi & Taylor due back, soon, I'm not sure they are going to add to the roster crunch by trading prospects, now. I have no problem DFA'ing Robles and demoting Danish. I'd be okay trading or DFA'ing Diekman, Davis and/or even Sawamura, but I'm not on board with doing this to Barnes & Brasier, right now. Of course, I'm not arguing we don't have room for a solid RP'er, right now, because we do or can make room, easy enough, but most GMs have more patience than we do.