You guys are all forgetting that the base is what determines the squad type, not the miniatures. TIE/FO sculps may be identical to TIE/LN ones, but if the base has a different icon, it's a different kind of fighter regardless of what it looks like.
The X-Wing is also pretty distinct enough that they won't be re-using the T-65. The wings are roughly half the bulk of the miniature, and the wings are split differently on the '70 than on the '65. It will be different.
We have precedent with the First Order and Resistance being tied to the Empire and Rebellion respectively, there is no reason to think Armada would be otherwise. As well, there is no reason to think FFG/LFL will veer sharply to another direction and choose a legends faction when current canon is up and coming and generating new things. FFG/LFL will only likely consider legends craft when they've run out of canonical stuff to present... which is why in X-Wing the Empire's saddled with utterly uninspired designs (TIE Interdictor, TIE Aggressor) in the space where isn't enough Imperial craft to introduce. At least the Gunboat got in before the TIE Oppressor...
Unlike X-Wing with the offerings of the bounty hunter craft, there are no distinct large stand-out space vehicles that have captured the imagination as much as the Bounty Hunters and Bobba Fett. Certainly not enough to open the door to being a sustainable faction in the future. Plus, as X-Wing shows, going that way will wildly affect balance.
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