During this time, is when many bands call it quits. Ironically, this is also the time when many bands are just getting started and gaining steam. There are many, many stories about how bands were just on the edge of discovery when they broke up. Just because people change does not mean they can not still work together. If you keep an open line of communication between all members and review and revise your goals on a regular basis there is no reason to break up when things get rough.
Successful bands are able to work through their differences.
In short, the way to success in the music industry has much less to do with the actual music than people believe. True, the music is important, but the most important thing is simply to persevere. You must be willing to do whatever it takes for however long until you get noticed. This takes total and complete commitment. You must love what you do.