I have been playing X-wing all the way since the beginning and I remember when the meta was Howelrunner and a TIE Swarm. Howelrunner's reroll to everything in range 1 is a classic example of what is called a force multiplier. Basically Howelrunner makes everyone better (to a degree). And the more ships you have the more Howelrunner helps you. This inspired people to bring lots of cheaper ships.
Over the past few months I have felt like the basic dog fighting in X-wing seems to be sliding. That is not entirely true since you still see high PS arc dodging aces. What you don't see is low PS swarms. Quality be it that expensive 7 point TLT or even more expensive 360 degree primary-weapon-firing ship, or a highly upgraded high PS ace seem to be really common.
Few better ships be they bombers or turret carriers is the Meta almost everywhere. When you get few ships, upgrades become less of a hard choice. I flew Nym at a tournament last weekend with seven upgrades, and I didn't really even notice until I had to find a place for all the cards on the table.
I think Force Multiplier ship abilities can bring the more-ships-is-better archetype.
All we really need is for the new ships coming out to have these pilot abilities or new EPTs. I don't know what it would have to be, but there has been a bit of talk about making outmaneuver just a universal rule, what if someone basically gave outmaneuver to all ships of the same type in range 1 (or 2) of it.
I don't know if this would bring back lists with 4 X-wings, in them, but it might.