If they get desperate, they will call all callable mortgages--which depending on how the note is written, could mean any mortgages that are deliquent at the time--all forebearances would be nullified as well as any loans with a call option. Balloons might be required to pay up rather than have the option to automatically convert. They will be looking for reasons to call notes--especially those with lots of equity which they can flip for quick cash--delinquencies of 16 days that weren't minded provided the late fee was paid will become at risk to be called.
As it stands now, I wouldn't be trying to buy or refi a home without spotless credit and great assets. The current mess is going to have a trickle down effect, and private insurers are going to cherry pick and write only the cream of the crop loans. Anybody under a 720 credit score will probably be turned down for PMI--without significant compensating factors (ie lots of cash reserves), which means that buyers will have to reach out for FHA loans if the property qualifies and they can't get a FNMA/FHLMC loan.
I expect that FHA will eventually tighten their requirements as well, especially because Countrywide is the largest originator and servicer of FHA loans in the country.
All in all it's going to become much more difficult to get a mortgage, and be much more difficult to get someone on the line should you have a problem with your Countrywide serviced loan.
Anne