(1) No way to trade bitcoin or exchange it for goods and services.
(2) All governments of the world placing a ban on bitcoin and bitcoin related activities making it highly illegal.
(3) The entire bitcoin network and nodes going offline making it impossible to even make underground transactions in bitcoin.
(4) Another crypto overtaking bitcoin and value and more people shifting investment to this new crypto.
1. Bitcoin has been adopted by many establishments already and there are some merchants around the world who are accepting cryptocurrency as a mode of payment and when it comes to crypto what is the first word that comes to our mind? Bitcoin so this will not happen at least for now since many are accepting it. There are also many ways to trade Bitcoin too.
2. Although there are some governments who are prohibiting their countrymen in using Bitcoin, there are some countries too that are either supporting it or just neutral with it or they aren't doing anything that is related to crypto. Will this happen or will all of the governments make some plans in order for Bitcoin and cryptocurrency in general to be banned?? I don't think so.
3. Nodes going offline? I don't think that it will happen too.
4. Gaining trust of the investors will take a long time. It took many years for Bitcoin to gain trust of the investors. If there will be a crypto that will overtake Bitcoin then it will take years to gain trust of the investors and one thing more is that, I don't think so that people will shift especially if they know that Bitcoin is already working.
In short, all 4 of what OP said will not happen at all so in conclusion it never happen .