What do you think a about it? is it good or bad for bitcoin?

Gold in general is no better. The value of gold is nothing more than a result of a global consensus - at the moment everyone agrees to consider gold a measure of value, simply because this measure is in some form or another necessary. If we assume a utopian situation, that tomorrow everyone agrees that gold is not such a measure, then it will be good only for the production of quality wires and trinkets.
The btc is gaining momentum for exactly the same reason - the global consensus towards the btc is constantly being strengthened. In this case, unlike gold, the cue-ball is not only a measure of value, but also a settlement system, and gold is not a competitor for this parameter.

Like every other investment such as real estate, stocks and other forms of investment we know that you can invest in that kind of things and then you get something like say a Certificate or a Binding Document as a proof that you are part of that investment, now that of bitcoin all you have is just your address, your password, key and seeds as proof of the ownership of the wallet.

BTC

So now if one is considering buying bitcoins and saving for his/her children in the future is there any way to do that with bitcoins apart from having to write down your details somewhere. I'm asking because with that kind of stuff if no one knows your seeds or password no one can get the coins.