this sounds like a dream but it seems like Australia's wide acceptance has become their very own enemy because now gamblers are not so excited to play slots or poker anymore
It depends on whose dream it is. Having slots and tables everywhere doesn't mean that you have the money to gamble on them.

don't be mistaken, they are still gamblers but they are now a lot more interested in sports betting. casinos nowadays in Australia are failing and losing profit while sports betting platforms are the ones winning
If you are referring to physical casinos, then yes, most likely they lose some clients. However, this can't affect online casinos since most of them have sportsbook and casino games. So, I can't see how they are losing.

is the failure of casinos has got to do with too much accessibility therefore not generating any more excitement? or is sports betting just the new trend which is where the new generations flock towards to? are you still team casino or team sports betting?
It seems that you are a bit confused about gambling. In our days, you could register in an online casino and gamble whatever you want in almost all the events and games. I don't see any new trend or focus on different things. Just that now we can gamble from everywhere, nothing else.