It would be a brave politician who would propose an inheritance tax.  We may come to that, and it may be a good thing, but people hate paying probate fees. Having to pay an inheritance tax would send them ballistic.  It's not just the wealthy who would be affected.  The beneficiaries of every parent who bought a house in Vancouver's west side for $36,000 in 1975 would be up in arms, and for those beneficiaries who's parents didn't luck into the real estate lottery the argument would be - but they already paid tax on that when they earned it.
Which is pretty hard to argue against.