As the 457 is a temp visa sponsored by your employer. I wouldn't be too worried about committing to 3 years cause if either you quit or they make you redundant you will only have 90 days to find another sponsoring company before you have to leave the country. If you want to stay push them for a PR visa. That will show if they are committed. Either way looks like you get to stay here a little longer which is good [emoji6]