You should because both networks will be history by next fall. They will be replaced by a new network known as CW. In Chicago this network will air on WGN Channel 9. This new network will be a joint venture between CBS (who owned UPN) and Time Warner and Tribune Company(who has a 22 and a half stake in the WB which it will relinquish).
I wish I knew what the programming will look like. UPN has been chided as a sort of BET 2 with a couple or so nights during its programming week dominated by programming featuring black characters (Girlfriends, Half and Half, Cuts, . I would wonder about Smackdown, Smallville, and other programs that airs on UPN and WB.
In either case perhaps with this merger this may prove to be a wise decision. Though I would ask what will become of WPWR-TV Channel 50. It is still owned by FOX Television Stations Inc. and they also own FOX 32 Chicago.
UPN, WB to Shut Down; New Network Formed from Chicago Tribune
UPN, WB to combine to form new network from Chicago Sun-Times
Tribune's WB Network to merge with UPN from Crain's Chicago Business
Closing the WB Network fails to lift Tribune stock price from Crain's Chicago Business