You're right, kind of. The problem is if the guy putting the truck together can't afford to buy the truck, that's a problem. Henry Ford figured that out and made himself a ton of money.
Here's the issue as I see it. All of these semi-skilled jobs are being replaced with technology or offshore workers. Okay, what do you do with all those people? Re-train? Re-train for what? Everybody isn't capable of being an engineer, and while that would be a great field for some to pursue, there aren't enough really high skilled positions to accommodate the entire workforce. It's a problem, it's been a growing problem since the 70's, and there isn't anyone that has come up with the fix.
Trickle down is a fantasy. It's as much of a fantasy as democrats creating foreign policy based upon how they wish things were. If there are no jobs for the average Joe, and the Board Boyz aren't willing to carry some dead weight on their payroll, and you're going to charge 35K for a f'n Chevy, and 250K for a f'n 3 bedroom home, something has got to give. What's giving is the complete and total separation of the actual economy and a market that is supposed to reflect that economy. You end up with what we have. A very few making boatloads of money while the masses fall further and further behind. People aren't going to just lay down and die. And then people wonder why the Bern has such an appealing message to those folks. It ain't real hard to figure out.