Reality - Most of the users store their coins in one of the exchanges, right?

I would appreciate your help in the question of where most of the users holding their funds [crypto] - on wallets or on exchanges?
If you look at the majority, isn't it true that most of them holding their funds in one of the exchanges? and not bother to hold a wallet being too lazy or incapable? especially when we talk about the new wave of alt coins holders?

What percentage of the crypto users holding wallet at all VS users holding their fund in one of the exchanges [without holding a wallet at all]?

Can this number be figured out some how?

Is it true that in the future, all the serious exchanges will need to partner with serious wallet service [or build one] so the users funds are not being stored on the exchange's-not-so-secured wallets?

So soon we going to see the exchanges asking the users for their wallet's addresses and make sure that user's fund are going, at one point, to their personal wallet and not stored in the exchange - right?

Thank you.