queenie needs lots of us mugs here to work hard and pay tax for the palace and everything else.
No, because we've already established the RF are paid for out of the Crown Estate - which you want to do away with. Taxes don't pay towards the RF.
So, instead of the Royals being funded by a small proportion of the profit and the rest going to the treasury for the good of the country, the income from the Crown estate would cease, and we'd have to pay for an elected Head of State out of taxes.
I'm not an accountant, but even I can see that the Treasury is worse off by doing that.