"no problem with" is HARDLY an endorsement (how would people react to "I have no problem with [insert race/religion/country other than my own]" from someone? wouldn't it sound slightly as if that was NOT truly a favorite?) and the implication is still "my #1 desire was disregarded." Carter doesn't own the property, and since this year, he's also grateful Fox invested in making more X-Files, so why now, after all the decisions were already made and the Bluray went forward without his major involvement, would he shoot himself in the foot by making a public stink over the aspect ratio issue, which even fans of the show largely do not understand, in a technical sense, causing almost all fans to side with Fox's preference of 16:9? he wouldn't. this is exactly why Fox judged an all-16:9 release to be more commercially viable- they know Carter has no legal power to oppose them (they own the rights), and they know XF fans, like many other fandoms, are ignorant about HD and aspect ratios, ignorant of the fact that a 4:3 aspect ratio is NOT mutually exclusive with HD, Fox know most XF fans are not aware these are two entirely separate issues, they know most fans (yourself, for example) assume they are the same, because they first gained access to HD and 16:9 at the same time, when they got an HDTV, and they know a large contingent of possible Bluray buyers are just dumb enough to actually complain or even demand money back if Fox offered them the courtesy of remastering the show to HD in the original 4:3 form intended by its creators (and still preferred by them, market realities aside) because they know such fans would assume, hey if it's 4:3, that must mean it's not really in HD quality.
when you say "I imagine...," that's an idiom/expression that is often a very polite way of saying "I want..." okay? Used by circumspect, polite people, but often used specifically, in situations where what they WANT is actually UNDER THREAT, but they are trying to bend over backwards to BE NICE ABOUT IT and READ THE BEST POSSIBLE MOTIVES IN THEIR OPPONENT or even just SHAME THEM BY PASSIVE AGGRESSIVE NICENESS, in order to hopefully CHANGE the situation SO THEIR DESIRES STOP BEING DISRESPECTED. Like if you asked a woman from the "greatest generation," perhaps your grandmother or great grandmother (assuming any of them were raised or socialized in such a way that, despite having strong opinions, they were taught not to openly voice disagreement- as many women were in those days, much more than now), if you asked them a question that involved a pretty blunt question about what they wanted, AND they were involved in a complex situation where they had an ongoing (not quite optional) relationship with someone who (for better or worse) had more power than they did to make decisions (a husband or boss for example) and where that person's stance was quite possibly (although not absolutely definitively, the-decision-is-already-final) trending toward being opposed to what they wanted... well, the construction "I imagine..." might be used by that woman in order to subtly assert her own opinion without seeming to tread on the other's opinion (but slyly, also with the hope- unfortunately likely in vain- that knowing SHe imagines a little differently, it might shame her partner/opponent into reconsidering and deciding to respect her). Carter is the woman of the '50s, Fox is the husband. Carter cannot just say "I want x" if Fox wants y, and already seems (as they were in 2014 when that AMA was done) dangerously close to doing y with or without him (which is ultimately exactly what they did- without him). but he can say "I imagine y" in the hopes, just maybe, his fans might at least have given a shit and taken the time to understand the issue of how you respect the art, and pressured Fox not to fuck it up. We, of course, let Carter down in that regard. His imagination was more optimistic than the reality, which is that XF fans largely either don't care about The X-Files as a work of art, or do care about it but distrust Carter so much due to his history, that we would have needed, say, GA to be talking about that aspect ratio issue (or at least Darin Morgan, Vince Gilligan or Morgan and Wong) before we would care.