I love my steam deck but it's huge and heavy. I often just stream my steam games to my phone with a razor kishi from my big gaming machine.
Looking at the performance of the new Lenovo handheld running steamOS, it's not much better than the steam deck.
So I think we are atleast 2 years off from a new steam deck. Maybe longer.
I think for games like Elden Ring, the new switch is going to feel great.