Miners will still be able to turn a profit from transaction fees.

Assuming the prices are going up to right now unseen price levels. Then yes, they will be able to mine at a profit when also the fees get higher due to the fact that there is nothing left to mine.

currently we see 0.3-0.5btc tx fees for each block and it will increase with time when more users start using bitcoin and do transaction.the time when bitcoin block rewards go very down price will also increase to make it worth mining.at that time this small tx fees will enough for miners to make profit from mining.

Also, fun fact, if I'm not wrong, there will only be 21 million coins released and we have currently mined 15 million..

Of course there will be money to make in fees but that's not the only reason to keep the network security in place. If Bitcoin survives in its present form for another 125 years then millions of businesses will depend on it. Those businesses (let's say, like BitPay) will keep farms going to support the system that their business depends on. Fees collected will be a secondary concern for them.

In 2140 the issue of coins will end but mining will still be needed. PoW is an essential part of the network, so mining will still need to be done.

That has a low chance of happening as price increases as demand increases(most of the times)
As to your question, you'll be dead by then . From what I heard from DannyHamilton and other members, the year the last BTC(partial) will be mined is 2140*. So yeah, lot of time for that to happen. Anyway coming back to what will happen, miners will just get the tx fees, and hopefully by then either BTC price is very high that mining is still sustainable or transaction fees increase. The former is more likely I believe.

*Googled and it seems , its just an estimate but you get the idea.

** Forgot another possiblity that is, (majority of) nodes decide that number of bitcoins should be increased, so the protocol may be changed

Talk about mentality, you make it sound way horrible

ha, lol. I sure appreciate their work.