Pure BS and spoken exactly like someone who has never used a Fusion drive.I for one am not gonna get any fusion drive ever in an iMac. I want SSD. It's safer, cooler, less noisy, faster/always fast etc., pretty much completely superior to HDs in every way expect storage size, but a lot of people don't need 1-3 GBs of internal data in their iMacs!!
I have the maxed out 21.5" iMac. If Apple had offered the Fusion drive option on the base model it probably wouldn't have changed anything. I wanted the i7 and more memory along with the Fusion drive so I don't feel screwed.
Creating your own Fusion drive (what I like to call "Fusionstein") is a good alternative but its not officially supported by Apple so who knows what can go wrong. Also, the OS build on Fusion drive iMacs is different than non-Fusion drive iMacs so if you Fusionstein your iMac, it may work but you still may not be getting a fully functional Fusion drive even though it appears that way.