Rumor is that the 14/WPTO tower on MU's campus will be disassembled some time after the 2009 transition since their digital signal is being broadcast from WXIX's tower in the West End. However, they would definitely repair as the tower is home to critical university services for the time being.
The other stations use the same tower for analog and digital, so they would be forced (not really, but if they want any viewers...) to rebuild their tower. In fact, a lot of smaller stations in Cincy share a tower (14 WPTO-DT is on WXIX-19's, 25 and 38 are on WCPO 9's, WCET 48 is on WLWT 5's).
As far as I know, I haven't heard of any tower damage, and any stations that are down are due to power outages.