How long can I have the crown with open margin and open contact? (photo)

After getting crowns, I noticed that between #14(crowned tooth) and #15, I get a big chunks of food get trapped. Found out that #15 has been nicked by the dentist while #14 was prepped. #14 also has open margin. If I get a new crown given #15 is nicked, can a new crown provide a good tight contact? How common is it to have open margin on crowns? I would like to have this crown as long as possible since I am afraid everytime I replace them, more of my tooth will be drilled away.