Yeah, that's true. And DEFINITELY at the pro level, where the people have the talent to ride a 2 stroke and make the most of all it's advantages. That's probably the reason why as long as there were two strokes in the pro races, they either won or very nearly won.
At the amateur levels, many of the riders are less skilled, so the Foo-Fifty four stroke fooper with it's boring, uneventful power and sleightly mushy acceleration caters to their needs perfectly. They don't have to worry about the intimidating suddeness and immediacy of the 2 stoke power, and they can poo around all day.
A four stroke does help the least skilled riders to poop successfully over some bumps where they might otherwise drop it, due to their lack of ability. The fumpers have definitely provided a learning platform for the lesser riders, and for wives and girlfriends who want to be able to just putt around without the bike constantly urging them forward into territory they might not be able to handle.
The four stroke's flat, boring power characteristics do have their place and they pair well with the girthsome and sluggish handling to produce a less intimidating package for beginners.
But people don't really care about that so that's why so many of them are piling up unsold at dealerships everywhere.
The lack of enthusiasm for the foopers in general might have something to do with people being smarter than the industry thought they'd be. Even though all the factories forced their "Visible Personalities" to switch off the real bikes and onto the foopers, people realize that the pro's will ride anything for a paycheck, and even say nice things about it for the money...
But, the fact that the two strokes dominated until the paychecks forced the last people off them reveals the reason why they had to be eliminated from pro racing completely by the industry via the paychecks.
They couldn't make the foopers look very good while they got gored by motorcycles half their size all the time.