I meant it in the sense of the younger generation has more exposure to concepts like encrypted communication and peer to peer communication and encrypted ledgers, etc. They might not know how exactly they work, but they know they exist and have an inkling of their attributes as they pertain to data secrecy, auditability, etc...
(Whether that's a good thing or not I don't know - perhaps you'd end up agreeing with whichever side has the most believable technological shibboleths, which isn't that much different from the current best practice of listening to the side with the better attack ads).
I think that the details of the vote will indeed be opaque to most voters, but I think that's the case right now for most of us. As a voter you must have some trust in the process and in the fact that the correct auditors have vetted it. Hopefully it's going to get there for electronic voting some day.
The elder generation grew up with stuff where you had to be more cautious of damaging it, while the younger generation is far more confident with "randomly mess around until it works", because they grew up with products that were designed to be more forgiving.
Whether the candidates themselves, all of them, can be trusted is a much more serious problem with democracy, I think, than "dumb" people affecting the vote.
dumb people vote for dumb things, whether issues or candidates.
Also, gay marriage isn't really a complex issue: Even the dumbest person understood the consequences of banning it, they just were that sadistic. Agreed on Brexit though.
As for the implications of your premise: Do you feel comfortable in not having a say whether you are taxed more, have your hobbies criminalized, or get sent off to die in some awful war somewhere so that some jerk can get rich? Because that's what you ask for when you say some obnoxious technocrat is fine running the country with no input.
And before you mention passing an exam or something to vote, that's just a direct path to corruption and disenfranchisement.