if mining is reduced 100% all the mined coins are stuck and basically have no protection against double or triple spends if two people start to mine.
If mining is reduced 100%, all transactions stop and protection against multiple spends becomes unnecessary.
reality is you want btc to stay with a high price you need lots of mining.
I agree, but this has nothing to do with the rate of "production", which is basically predetermined and vanishing. You know this.
gold baseline price is not protected by mining in the same way.
Right. On the contrary, it could be argued that the price is hurt by mining.