Why would there be remorse over Louisville?
Louisville has a rabid fan base and has near total sports entertainment control of the Louisville metro - meaning they are the only game in town. There is no nearby competing P-5, no nearby NFL, NBA, NHL, or MLB team.
Maryland was a dying entity killed slowly by the quadruple blows of Len Bias' death, an egomaniacal Chancellor and President, changing demographics at MD, and the success of the Washington Nationals.
Any buyer's remorse should be saved for Miami and perhaps Boston College.
We knew we were not getting a Cadillac with BC. We thought we were getting a Caddy with Miami.
But the entire premise of the question presupposes that someone was available on short notice that was a better overall package than Louisville. We know that neither Cincinnati, Tulane, Navy, or Connecticut, brought a better overall package to the conference.
I would go further and suggest that Louisville is a better overall addition than Vanderbilt or Purdue, perhaps even Northwestern (which of course assumes these programs are seeking an exit from massive state school competition - which is not readily apparent at this time). \
Now imagine we got Texas when we added Louisville. Their football program is in the toilet, their basketball program has fallen on hard times. They can't keep a new AD. Would we have buyer's remorse?
What Louisville has now is the equivalent of a curable case of VD - syphilis, gonorrhea's, or chlamydia. Louisville does not have terminal cancer. UNC has a visible case of herpes right now, but eventually it will clear up before the next outbreak.
Miami might have an autoimmune disorder and we will see if it is chronic or acute.
FSU just sprained their ankle stepping over yellow jacket nest.