Although your post is very insulting to me personally, as I am a "housewife", disregarding that I must admit that, given the evolution of how convictions in certain crimes are now achieved, I and in fact most people I know (even professionals that you would rank above silly me) would be ill-equipped to deal with complex evidence.
An example: just the day before yesterday, there was a horrific crime in our area. Achieving a conviction is going to require evidence that would be difficult for me to understand. Given my personal experience, on an arson charge I would follow it rather easily. However, when it comes to the medical aspects (injuries that may or may not result in death), and DNA evidence I would, in fact, be in over my head unless it were simplified.
Now, I may be wrong, but I have to assume that a lot of very complex scientific evidence, during trial, is overly simplified so that jurors can understand it. For instance, if something were to be explained as having a more than 90% indication of the party being charged as guilty, I wouldn't know enough about what that meant to make a truly educated decision. If, on that same evidence, someone were to testify as to why the accused fell into that smaller percentage, thus proving innocence, in truth, I'd be more swayed by the more than 90%, which to me would seem overwhelming. I mean, everyone claims to be the exception, right? In other words, because I really wouldn't understand it, my decision would be an emotionally based one.
Certain trials, of course, wouldn't involve anything "over my head". However, I've never been certain in the fairness of having untrained medical professionals decide on a case of poisoning, for example. Barring evidence that is pretty simple to grasp (as in one local case in which a conviction was reached due to surveillance footage of the crime as well as diaries kept by the person convicted), I tend to agree with you.
As the abilities to collect evidence have evolved, something else in the process should have evolved, too. I'm just not sure what that is. A simple solution, though, to have more qualified juries, might be to simply have evening trials. Silly though that may sound, at least everyone could feel comfortable knowing housewives like myself weren't chosen just to fill a seat. Plus, you know, it'd be easier for the housewives with children to get off to school and all that, and leave her time to cook the man some breakfast. The courthouse would also be open, which would be more convenient for all the working stiffs...so, you know, we housewives wouldn't have to take care of complex things like vehicle registrations or taxes.
Of course, that wouldn't work for the retirees, right? Wheel of Fortune is an evening program, I assume. However, the terminally unemployable could still sleep til noon...