IMO
I can't really see myself waving at 4th gens because lets face it, or atleast near me, soccer moms get the v8 because she wants the most powerful one. They buy it for different reasons; luxury and seating capacity, but for most of them it could say Yotota and they wouldn't really notice.
The only way I'd acknowledge a 4th gen is if they show interest in the truck by modding it for offroad and if they have at least enough knowledge about the runner history to realize that mine is one as well, cause if they don't have any mods then 90% of them are people who don't know what we love about what they have. Similar to 3rd gen owners, but it happens less than with the new model.
When it comes to 1st gens and 2nd gens, it comes to become more of a collectors car. And i don't mean collectors like a mustang 64 1/2, i mean more like a car that you get because its cheap and you come to appreciate it, and its more than just a 1-7k car, eventhough its barely worth the maintenance/tires/gas mileage.
I park in a lot with another 2nd gen same color, same year, similar mods, and I've parked next to him three or four times, and he's done the same. Its funny that way... mutual respect.
but mine's better anyway, his is like mine sans the aux lights, gguard, taillightguards, aggressive tires, and... stickers, but he's got a 5-speed, I'll give him that much.