Haha for me it’s the other way round, economy kills my timing cause i’ve to focus on it.
I try (and that means it does not happen too often) to use both of them, by playing same lines in different ways.
That’s fine to me, from time to time it’s even interesting when accents change without thinking about it.
I wouldn’t mind too much about losing the abilities in a physical way, as far as i can tell the muscle memory seems to know forever what to do and the muscles seem to be able to do picking forever (at least in my case it is like that).
It might be another thing if you tend to ‘ignore’ specific techniques because you prefer other ones.
That probably the same thing as getting rid of habits - and I see no good reason to get rid of good habits.
So if you feel confident with crosspicking, and maybe have one or 2 pieces that require it, I wouldn’t mind.
It’s like riding the bicycle, you can go by car for years, but when needed you don’t have to relearn it.