So when the miners are no longer rewarded coins, why would the miners keep paying for hardware, labour electricity, internet, rent, cooling, etc.?

Will they then be paid with only transaction fees?
There is not enough ROI in fees alone now, so what is going to happen?
Increased transaction fees?
Will that cause everyone to drop bitcoin and move on to a cheaper coin?

Can someone explain the end to me.  I do not understand it after all coins are mined - how the system will continue on.

https://bitcoin.org/en/faq

"The number of new bitcoins created each year is automatically halved over time until bitcoin issuance halts completely with a total of 21 million bitcoins in existence. At this point, Bitcoin miners will probably be supported exclusively by numerous small transaction fees."