I don't think this dance of viability is the way to go. So, you drop palp, and then nobody has much stock to run Lambda (they'll just Run Upsilon instead, which with some of those pilots and upgrades is going to start happening anyway), people will probably not feel good about a lot of the more fragile imperial ace type ships, so it'll go back to defenders. Which for the longest time were not viable in of themselves. Do we (or rather, does FFG) need to keep doing this dance so specific lists are viable? Ships makes sense for players and them. They want people to use what they buy and if they aren't then that's a perfect opportunity for additional product to help move ships up. There's a very strong argument that Palp himself allowed the viability of Shuttle+Two Aces to become real. You pay a shitload of points for his swiss-army-ness, whereas other upgrades cost you less to get similar dice mod elements in more specified conditions.
I know a lot of the palp haters and viability talkers hate "complexity" and want to just slash-n-burn the whole game for some new edition where we'd have this problem all over again, but honestly, I think this is a thing where more expansion of the game will help. Time and variety is needed, The way to help imperial viability and variety is not to kill palpatine directly, but to present them with more options and strategies which are also viable (again, like cards like Stridan or Hux will probably be doing). If there are less choices, the winning strategies to pick will also get smaller. You need to make the game contain more choices, more combinations to prevent equilibrium and present more intransitivity. Only when you end up not introducing variety because a strategy is very clearly dominant and not intransitive should hard nerfs be applied (I/E, U-Boats strategy is so simple and beats so much more than beats it, it reduces variance)
As an imperial player, I'd agree with the idea we need *more variety*. I've stopped playing Imps for a while because we really only have two competive lists:
1/ Palp + 2
2/ Defenders x2 plus Defender/OML/Ace of choice.
That's pretty much it. There's the option of Deci + Defender but that's not the easiest thing to fly.
What Imps lack is variety.