I don't understand when people say a given coin is "easier" or "harder" to mine (assuming the PoW algorithm being the same). The more worth the coin, the higher the difficulty. The ratio between the capital in (electricity + equipment) and the capital out (mining reward) should stay roughly the same over a long enough time period.
Whether that mining reward will become worth more or less in the future, is just speculation.
Aeon is easier to mine with CPU compared to other coins thanks to the CryptoNight-Lite PoW algorithm, which is the main reason why I like this coin.
Both sides are right.
It is getting harder to mine (one gets fewer coins as difficulty is getting higher in time). Cannot combat this argument, but...
At the same time as you stated capital in vs out should be balanced, therefore it is not "harder".
It's like looking at a 9 or at a 6, depends on which side you are.
We are all speculators here.