A half-decent flash for a dSLR costs about $240 now (it used to cost about $400). That's a significant fraction of the cost of a low end dSLR.
On the other hand, the newest pro Nikon CMOS based camera has a maximal ISO of about 24,000. We can reasonably expect entry level dSLRs to have similar light sensitivity within 3 years -- if Nikon or Canon resist then SONY will force the issue.
I assume the 24K ISO on that pro Nikon is extremely noisy, but I'm guessing the 2K ISO isn't bad. With an ISO of 2K only specialists will need to use a flash.
I wonder when the prices will really start to fall? Probably when the used, but still quite good, flashes start to flood the market.