An end to capital gains tax would be an ideal scenario; given it would probably be too costly for the current federal government, maybe a limit could be put on it, as was the case a number of years ago. Maybe it's $100,000 or $200,000. You can do the math on whatever the right number is.
I think the concept you originally suggested in the election document--to just eliminate the tax on everyone's gains, or at least to defer it until they reinvested it within six months--is administratively very difficult to track.