While I can agree that so far Thargoids have been on a very slow boil, that does not mean it will stay that way, folks need to adjust their perspective and think longer term.
If you stand back and follow their progress its clear to see things are accelerating. At some point in the not too distant future, I fully expect to see players being interdicted by goids, with more random attacks in the bubble; once folks start to see their chosen home systems under attack they will start to pay more attention.
All the warning signs are there, however, folks need to prepare; you can't just dump a threat like the Thargoids into players laps out of the blue. With this communities track record for responding to increased npc threat the developers have no choice. Frontier have to give folks time to unlock AX weapons, guardian tech, and refine their builds to withstand such interdiction's. Anything less would result in the typical torrent of salt and forum whine.