A frequently long and complicated process to change credit and debit card processors will likely limit the impact of a recent federal supervisory letter on card processor FIS, according to some industry observers.

But others counter that the security concerns outlined in the letter, which prompted the NCUA to advise credit unions to evaluate their relationship with the card processor for 5,400 credit unions, are sufficiently grave that they will be enough to lead some CUs to leave the processing firm.

“This will cause reputation concerns for FIS and their Group Service Providers, but likely will be corrected by FIS and result in too almost no short-term changes by their processing clients,” wrote Tim Kolk, founder of TRK Advisers, a card portfolio consultancy that helps credit unions improve their credit card performance.