It's just the opposite, cash is still King.
 
He is comparing pears to apples, i.e. cash with investments. Cash is not an investment.  The fact that an investment goes up or down does not diminish the value of the cash.

Cash gives you security. It is not incompatible to have some cash and investments, it’s rather advisable.

The market will go down at some point, and, guess who will be able to buy cheap assets?

Those who have cash.

How have you noticed they attract a lot of traffic?

I think they only attract people who start and are curious but don't want to spend money buying.

I think it goes against the very idea of bitcoin: you hold your keys, you hold your money without depending on central banks or other institutions.

If you give (some of) your bitcoin holdings to a bitcoin pension fund, you lose that power.

However, you can hold bicoin as part of your retirement plan.