The reason bands become successful will usually be a combination of their talent and their likability. Losing a member can be a huge blow to a band whose fame (and usually fortune) are based on the group as a whole. Many groups have simply split up or suffered failing careers after losing a member but other have gone on to have the same, if not more success. Take a look at these bands who have successfully survived the loss of a band member.
The story of the Sugababes members is the craziest of all! The original trio were a successful pop group. One member left and they carried on their success with a replacement. Another original member left and again was replaced and the band carried on being successful. Then the 3rd original member left and was again replaced. So the Sugababes group went on to be successful even though none of the original members were there! In a cruel twist years later, the original trio wished to get back together and return as the Sugababes but were told they couldn’t as the Sugababes were a different group now.