This is why we have a search function on the forum. So that you don't have to make a collection of outrageously stupid assumptions based on a lack of knowledge.
As far as the limit getting closer the mining starting to be slow
The difficulty is adjusted every 2016 blocks so that a block is still mined approximately every 10 minutes. So the "speed" will always be approximately the same.
and profit is getting to be less.
If some miners leave, the difficulty adjusts so that mining would still be profitable for the people that remain.
I guess sooner or later a lot of miners will move to other cryptocurrencies like ETH and so
ETH is ASIC-resistant and uses a different mining algorithm. They would have to buy new hardware.
the whole meaning of Bitcoin is anonymity
Read the whitepaper.