Yeah sure, in theory.
And also in real life where one could see even more extreme set up. But in fact how many trees will die before one roots in such environment?
If it was that easy to get roots then we would just have to chop branches and trunks at the right place, put them in a pot and water them constantly to get a new tree no?
I actually did that with a retusa and it worked but the true is that their is a high % of chance that it will fail, unless you do that with a willow.