Interesting discussion.
I think everyone struggles with motivation at times. For me, at the moment, work is a struggle to get motivated, various issues, cash flow problems, lack of good staff, doing all the paper work without support, not enough hours in the day etc all of those things.
I've often thought about doing other things, been in this business nearly 20 years.
However, I look back, see what I started with and think I've had a good life so far, not brilliantly sucessful but comfortable with my lifestyle. I've trained apprentices in the past who have gone on to being very sucessful & fairly wealthy, I've got friends in the same situation but it all comes at a price. I look at the hours that these guys have put in and the strain that it has put onto their families and/or delayed the start of families etc and wonder if it was worth it. I'm pleased I have gone down my path but it often makes you wonder what if?.
I think you've just got to be comfortable with what you are doing as long as it is in accordance with your aims, however, I like Tony's analagy of the traffic lights, hold on orange but if/when you get the green (your own personal circumstances), then go for it.