I saw on the news that people were demonstrating in the streets in support of Navalny, which tells me that there has to be strong support for Navalny for them to do that.
Hence why Putin wants him dead, Putin is no different from the old guard Stalinists, in fact if you really look into his history you will see that he is the old guard. I hope Navalny is not killed while in prison, but once someone has a Putin Hit on them I doubt it is ever rescinded.