Well I intend keeping my Note 20 Ultra for a couple of years even though it has the Exynos 990, but only as long as the performance stays on par, battery life on the other hand will be my main concern more so after a year or so, as the battery degrades as it isn't great as is.
I personally don't think the future lies in folding phones, there will be a market for them no doubt & will get cheaper as the years pass & move into the Mid Range Market.
But the ultimate innovation will come with scrolling or rolling screen phones, as they can keep the slim candy bar style, have no crease in the screen & as glass technology advances they figure out a way to make glass roll without shattering, which is probably easier to achieve than making glass fold.