Endeavour's re-entry "Iffy" due to weather in Florida

An Associated Press article stated that Mission Control informed the seven astronauts that Endeavour had been cleared for re-entry following analysis of data beamed down from final thermal survey of their ship. The space shuttle was found to be free of any serious defects caused by space junk (over 10,000 pieces) that could jeopardize the decent back to earth. The shuttle had to land at Edwards Air Force Base in California due to bad weather in the eastern United States. How many safe re-entrys can future shuttle missions accomplish before one of those 10,000 pieces of space junk hit and damage the protective tiles? What can these future astronauts look forward to, another Columbia disater?