There's been a lot of press on lever guns in recent years which has likely fueled the lever gun revival. Most of us will never hunt griz or brownies, but the guide gun and its likes are hugely popular. Pierce and Scovill have written a bunch of material on the practicality of all types of levers, and that, and the fact that some of the little carbines (not everybody needs or wants a .45-70) have some distinct advantages for most of us, have swayed a whole new generation.
In .35 cal and down, the levers are flat and light, rugged and sufficienty accurate and powerful for what most of us do. The pistol cals add affordability and a pretty good mix of power in the magnum versions and capacity.
I would not let my .357 Marlin go, period.