1. It is only the beginning
2. You can solo interceptor's, I'd also expect to see the small scouts, like the crashed scout found near Pliedes.. Will Probably be launched form the motherships (Whenever they appear)
3. If you can't be bothered to kit out a single ship with anti-thargoid wepons, you won't be much help to anyone or yourself if the whole thing kicks off.
Not disagreeing with you as such, just wanted to put a point of view forward as it relates to building specific ships. For me, that issue is more related to my own OCD. You guys all know me by now, I really care about my ships' setups, I engineer them to the moon, I spend as much time in coriolis as I do in the game. As such, all my ships are as perfect as they can be right now, and I don't want to change them, not even just the weapons (but those wouldn't be the only changes they needed). So my only option is to outfit another ship from scrtch specifically for Thargoid fighting AND engineer it to the moon (with Thargoid specific engineering, all high capacity, no resists, etc) and then I've spent a BUTT-TON of time on a ship that can be used only situationally and is useless at just about anything else. I'm aware I don't NEED to engineer my ship to the moon to fight Thargoids, but every time I flew it I would be hearing a voice in my ear 'this is suboptimal'. Then what happens if FD randomly change the encounter again and that ship is no longer optimal (and a T10 is?), I'm gonna be annoyed beyond belief. Yes, I'm aware the problems are created by my own psychology, but Elite encourages me to play in this way in other areas (PvP, optimal PvE, etc), so it is FD that is departing from the model, not me.
If I did do that (build a ship just for Thargies), then I would certainly use it. But herein lies the problem, I'm more motivated to finish my Vulture and my AspX than I am to outfit ANOTHER gunship, AND engineer it to the moon. I already have a gunsihp engineered to the moon, that's why I want to work on the Vulture and the Asp. If I WANTED for ANY reason to go kill Thargoids, I would focus on a Thargoid ship, but I lack any reason to WANT to do it currently.