We have absolutely no idea how bitcoin will scale in the future. All all speculation are based on the short bitcoin history - where indeed we had huge leap of value.
From literally $0 to $1000 in four years - we all now live with expectation that we could see similar patter in the future, but this time bitcoin will reach $10000.

and what will happened after halving? what it means?  after halving difficulty will increase or decrease?

i like your word "Bitcoin will become the gold" and for next 20 years i do really hope that will happen but i don't think Litecoin will become silver in that year because i so doubt that there are cryptocurrency besides bitcoin can survive till next 20 years

Your not helping network running a full node on a raspberry pi.

In my town, I don't think the police even know what bitcoin is. Maybe they will just take it as a online token in a few years time... There is no law/regulation on bitcoin here...

I suggest some type of an incentive program.
Lets say for example for every 8 hours that a node is active the node's operator would receive a certain amount of BTC.

Some things to consider:

• Node Operators would have to prove ownership, perhaps by installing a signed message on a HTTP server with the same IP address.
• It would require some development work to fully automate.
• Such a thing would undermine the privacy that Bitcoin seeks to create.

nobody cares about your bronze age redeemer cult