Hey Albert,
I'm in a similar situation although we have been here 2 years and my husband really wants to go for citizenship so we will think of our final year here as a chance to see and do new things.

We find that that 'living the lifestyle' is very expensive and we have less disposable income here than in the UK but we do have a large house and an equally large mortgage and that was our doing. We wanted to come to Canada for the experience and I think after 2 years we had decided we had certainly had that! I can't wait to get home to the UK actually and if I had my way I would be leaving now but hubby is the sensible one!

Perhaps you should just treat it as an extended life/holiday experience and see how you feel a year down the road. As you say you have young kids. Mine are a bit older and they have certainly lost out with the 'education' system here.
Many Thanks