My view is that formation size changes are undesirable as we should at least theoretically try to match GW pack sizes. A formation size of 5 would mean people would need 3 blisters before getting themselves a uniform weapon formation, and then they'd be left with spare tanks too.
The reason I would favour 3+ is fourfold:
1 - It gives the Predator Destructor a unique niche in the Space Marine list, that of a lightly armoured AP / FF tank.
2 - It does not change formation compositions, army list structure, or require different points costs to the Predator Annihilator.
3 - It would seem to match expectations of what its stats should be, more aptly.
4 - It would make the tank useful, and occasionally worth taking. Predator Annihilators have a niche that makes them desirable, that of ranged AT which is rare in the Marine list. Marines do not lack for AP so the Predator Annihilator is never going to be desirable unless you carve out a new niche for it: That of AP/FF tank. And yeah, a nice FF tank to use as a prep formation meshes nicely with the Marine style of play.I don't believe it would overshadow Devastators as it would lack their flexibility, and their ability to enter cover.
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I don't think they deserve that high a FF compared to other units and to variant tanks.
A Hellhound has FF3+ and it only has a flamegun and a heavy bolter.
A Vindicator has FF4+ and it only has 1 gun.
A Land Raider only has FF4+ and most of its guns are AT (Not generally a indicative of a high FF rating).
Plenty of justification can be made when comparing it to other units.
As to whether it throws any variant tanks out of whack, the Land Raider Crusader will still have a better FF rating (Average of 1 hit rather than 0.66 of a hit in firefights).