In many countries they already are. In this country, not in my lifetime. However, knowing human tendencies to compete I'm sure even if everyone were a non-believer we would still find lots of things to fight over.

Despite lots of pessimism expressed here, and I realise it may take longer in America than elsewhere, but I give it three more generations in none theocratic countries before the "Nones" are in the vast majority.

In the UK the amount of regular worship attenders is less than 6.3% (English Church Census 2008 ) and most of those are JW's, Mormons, Muslims and Jews.
Most non white attendees are over sixty in the mainstream Christian churches or average over 30 in none white Christian churches where child attendance is usually compulsory.
Many denominations of Christians CANNOT recruit new clergy to the point where some methodist ministers are covering up to five congregations and Cof E churches are closing and or are being sold at an unprecedented rate.
In the Scandiwegian nations it is already far more advanced with less than 2% of the population identifying as Christian or church going.

I hope I will live long enough to see it, if the world's societies survives that long.

Unlikely

I don’t think so, because atheism is simply a negative reaction to religion. Without religion no one would identify as an atheist, even though they might technically be one.

People would have to find some other avenue for pumping up their egos

Hope not. How dull would that be. They would still start fighting as is evidenced here on this site.

Here in the UK perhaps soon, in the US who knows. But we could also be on the brink of a new dark age, the future is unpredictable. A butterfly flaps its wings and everything changes.

Probably not.

Was pondering that just yesterday… Again, lamenting the sad fact archaeologists and anthropologists will someday describe this time as when they still believed in gods.. So, the twenty-fourth century?

Who knows

No because many people will not be able to accept a life that just ends when offered an alternative.

No.

I feel like the rate of conversion to non-religious is increasing