Do you think they would let us change the IV's?

I don't really think it would be a good idea to do that on their part. Sure it be cool to be able to roll some of my units ivs but for IS I just can't see them doing that correctly. There would be no point in summoning as much to try and get that perfect iv unit. I also don't really see it being fair in a way because then everyone would try to get these units with this weapon which could maybe drive away new players from the app. Maybe they could have you can do it either once per month or like with the black knight deal once per player? But you could risk either getting the same ivs or even worse ivs than before. So I think staying where we are now with not dealing with them would be best.

God I wish.... I have too many unusable -Atk and -Spd units that i want to use but i just can’t (see: Ishtar, B!Sheeda, S!Chrom, B!Lucina, Sothe, Myrrh, Azura, Matilda, Tiltyu, L!Lyn, Deirdre, Julia, W!Hinoka, Bride!Lyn, etc.)

In terms of pure profits, we've had people spend thousands for perfect iv units and therefore keep the servers up.

On the other hand, I'd be more than willing to sacrifice upwards of 50 orbs to change my Grima to have +atk -spd.

I don't think changing IVs would be good for the game. Sure we all have units that we would like to have better IVs on, but that's why summoning for extra copies comes into play.

A more viable approach would be to ask for a way to change our characters IVs to neutral, so they are not rendered useless due to a -atk or -spd bane. This will not affect summoning for IVs as much for whales, since neutral is almost never the best IVs, but would help casual players to enjoy their units a little bit better.

While we would all love that, it's doubtful they ever will, because it makes people less likely to summon.