Junger might disagree, however I would not, haha.
The videos of guys getting killed on the bikes is obviously part of the battle, casualties are never going to be 100% avoidable. But I can still see them being effective, especially for the Ukrainians. They're small enough to fit in a trench if you needed to, which is a plus, cheap and easy to ditch if you have to as well. With the right training and employment I think 2-3 man bike elements with Carl Gustavs, SMAW-Ds, and Stingers would be nightmare fuel for the Russians.