In 2.0 is it possible to chain Swarm Tactics like in 1.0? I don't see any reason why not?
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Yes it is.

But, note that the old trick of chaining Roark's PS7 to everyone doesn't work; Roark in 2e doesn't actually change your Initiative, it just changes when you engage.

So to give a real world example, consider the list below

YYYY Not

(42) "Dutch" Vander
(9) Proton Torpedoes
(1) Crack Shot
(3) R3 Astromech
Points 55

(43) Norra Wexley
(3) Swarm Tactics
(9) Proton Torpedoes
Points 55

(32) Gray Squadron Bomber
(9) Proton Torpedoes
(3) R3 Astromech
Points 44

(34) Gold Squadron Veteran
(3) Swarm Tactics
(9) Proton Torpedoes
Points 46

Total points: 200

In this list, if Norra, Gray and Gold were all flying within range one of each other. They could all engage at Initiative 5. Dutch would still have to engage at initiative 4. Norra improves Gold's who improves Gray's initiative.