There is a lot of good will toward BYU right now but I don’t think it will last too long.
Utah has done BYU a massive favor by showing their true character so blatantly so quickly and creating such a stark contrast. And BYU has been a very positive addition to the B12 at just the right time.
Eventually things will even out and there will be more normal banter.
I doubt things will ever get to the MWC level where so many of the fan bases just despised BYU.