The debate (and yes, in some architectural circles there now seems to be an actual debate) of the merits of brutalist architecture is interesting. It appears to have been gaining somewhat of a cult following.
It seems, for all architectural styles, there is a period where they are super trendy and everyone is doing it, and then they fall out of fashion introducing a period where the structures get old and deemed to be horribly outdated and decisions are made to replace them with the style du jour. Usually, after the examples of whatever style get more rare, there is a revival and celebration of the style. Victorian...for example.
For brutalism, there has certainly been a trend in the recent past to take those structures down. For instance, there is a push to remove, instead of renovate, the FBI building in downtown DC. But there also seems to be somewhat of a renewed appreciation for brutalism that is bubbling up since the style isn't as ubiquitous as it used to be...perhaps making them stand out.
A Pitt example could be the Towers...the outside of them...not talking about the room size, functionality, etc.... and compare them to the look of the newest dorms...Nordenburg Hall, Panther Hall, Ivis Hall. Which are more interesting, visually? And yes, Pitt is planning on renovating the towers (combining rooms to make them bigger), not replacing them, as they certainly are a campus landmark. And as I mentioned previously, what is different about Pitt's brutalist buildings in the "professional quadrangle" (Posvar, David Lawrence, Hillman) is that they're all clad with limestone instead of just exposed concrete as would be typical for classic brualist structures. So with that said, is there going to be regret 50 years from now about what Pitt is doing to the outside facade of some of these buildings and a desire to restore them to the original intent of the architects (as is now going on with the William Pitt Union... perhaps a whole different thread)? Who knows?