Who knows, maybe difficulty won't keep skyrocketing if all the promised ASIC deliveries don't come to pass and/or the BTC price keeps dropping. BTC losing more value would obviously negatively impact ROI though. I tend to think people who do get ASIC devices will mine with them no matter what though, since they can't do anything else with them. So the difficulty skyrocketing is virtually guaranteed, only an impediment to ASIC devices being delivered can prevent it.
You dreamer ! Today is an all time high regarding Network total ! 237.480 Thash/s as I write this.
Difficulty is going to explode any time soon.
Nightowlace said it very well : "Mining game is over. The people who won were Avalon Batch 1-2. The people who are enjoying some success are those who are receiving BFLs now. The ones who ordered 2012 BFL's and Avalon batch 3 will see some profit. Anyone ordering mining equipment now is throwing money down the toilette. "
DO NOT INVEST IN MINING ! You are sure to loose money, the game is indeed over...