You completely disagree, but you also seem to have completely missed my point; I'm not saying that SSD's can't be a benefit, what I'm saying is that the benefit to entry level users isn't strong enough compared to the extra cost or the sacrifice on capacity; users who are aware of the advantages can easily pay the extra cost to get the improved speed, and I expect the majority of users here are aware of the differences, so can and will make that decision when they purchase their Macs.
But for the user who just wants a computer to get online, do some light office work, get content on their iOS device (maybe use the new Continuity features of Yosemite) etc., the speed advantages of the SSD are going to be largely invisible to them as OS X does a pretty good job of preloading apps, and with 8gb of RAM that will do as good a job of accelerating the system as the SSD does.
I mean, even a relatively slow 5400rpm laptop drive still has an average seek time of 15ms, and a sustained read speed of 150mb/sec. While an SSD's "seek" time is largely non-existent and typical speeds are up to 500mb/sec, you'll only notice the difference if you're loading huge files that need that kind of sustained speed, or your drive has a lot of random reading/writing of small files going on. But like I say, a system with plenty of RAM shouldn't be doing a lot of random reading and writing, so the performance of a 5400rpm drive is still plenty for the kind of users that an entry level Mac Mini or iMac is intended for.
Besides which, there's just no point in increasing price or crippling capacity for the entry level model when it can easily be left up to the customer whether they want to make that sacrifice. I mean, there are people using Mac Minis as servers; if that means holding a lot of content then an SSD will cripple functionality, even if it might have better overall performance. Likewise with media centre type uses of Mac Minis, where all you're doing is hosting a lot of music or HD movie files, in which case capacity is far more important than an SSD as they're no point in a media centre being a tiny bit more responsive if it can't hold your media library.