Its a good thought process & probably one that each & everyone of us ask ourselves 'over & over' again.....I know we did & to be honest we still do, frequently.
We did see a piece of Australia being Brisbane, Gold Coast & Sydney. We wanted to have no regrets & go for it & the time was right, any later we may or rather I may have bottled out !
To date our kids love it here, I am very proud of what them & hubby has achieved in a short space of time. Some days/weeks are harder than others, but in summary I don't miss the UK AT ALL, just friends & family............oh & my salary LOL !!