I think you may read more about Bitcoin Cash showdown in November 2018 (there you will find enough numbers)
Bitcoin Cash and its copycats don't offer anything which would allow them to take over Bitcoin. Bigger blocks are irrelevant if no one uses these coins in real life. Further, miners themselves are pretty much irrelevant too, and if a coin dies a slow death due to lack of interest, it will be an exercise in futility and stupidity to pour resources into it just to keep it alive (I've seen such things and it was pathetic, to say the least). In simple terms, miners are mining because they love profits, not because they like Bitcoin or Bitcoin Cash
As they say, profits trump prophets
You see no reason the miners are keeping BCH around.
But they are the ones keeping it afloat, because they think the bigger blocks will mean more transactions and more fees in the future , which is why they are expending resources on it now
I'm not sure it is miners keeping BCash afloat
I'd rather say it is die-hard cultists who can't accept they had been fooled by fraudsters like Roger Ver and Craig Wright (when the latter hadn't yet forked off). Miners are Bitcoin agnostic, so to speak, and they mine the coin which is more profitable to mine at the moment. Personally, I don't think they have any delusions about "more transactions and more fees in the future"
Again, you make an erroneous assumption and then proceed to make erroneous conclusions.
If no one uses a coin, it is set to die, and miners couldn't and wouldn't do a thing to prevent this
Well BCH is still here , so it seems there are errors in your understanding of it's supporters motivations.
In my viewpoint the miners are taking a long term strategy because of a lack of faith in BTC long-term profitability.
The fact you are unable to accept this with you current mind set , is more your problem than mine.
When you take off those blinders, it is not hard to see what is going on.
Good Luck in removing them.