401K rollover expectations to independent brokers (baby boomers)

I am working on assumptions for an M&A project and need to make an assumption regarding what percentage of 401K money/assets will flow to independent brokers as babyboomers retire and 401Ks get rolled over to IRAs.

All searches seem to reflect articles offering advice to babyboomers who may be looking to rollover. None seem to examine the forecasts of how the assets will rollover or to whom in what proportions.

Does anyone have an idea on this kind of assumption? I am wondering what share of the flow could Legg Mason expect.

Thanks in advance FeistySpice

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