The irony here is what UBS calls 'the great transfer' is inherited wealth going from generation to generation among the wealthy, yet what most people will think when they hear this phrase is something different. They will think of the ongoing growth of inequality and the transfer of wealth from the majority upward to the super-wealthy.
UBS talks of a 20-year timeframe where they see this continuing, but I wonder. I suspect all that wealth is on flimsier foundations than many think. A lot of today's wealth is based on sky-high valuations for stocks and property. I wonder how long they will last as AI and robots does more and more work - reduces incomes, but also reduces prices and makes deflation a permanent part of the economic landscape.