I myself am not terribly worried about it, since those are probably the only two sea-worthy submarines in the entire Russian fleet.
The Russian Navy is working on scrapping most of the soviet era fleet and consentrating on building a much, much smaller but much more effective fighting force. Some reports say their long term plans are to end up with only 20 submarines, but have much higher reliability. They are not wasting resources trying to maintain the 150+ subs they had 20 years ago.