If we are in a bubble then it is just the start, we haven't reach the top yet. Of course every bubble is going to be burst, but then again, we are now in the levels that we haven't seen before obviously so we really don't know how far will this massive run will go, it could be a 6 year bubble or 3 year bubble so it's hard to predict now as we are just starting and it could end at $100k or even more.
This bubble is indeed one of the biggest one and the larger it gets, the scarier it will be when it burst down either slowly or instantly. As for now, many people are expecting that it's near where bitcoin will reach $40k even though it's just the start of the year. It actually feel good to think of it like that but let us not forget about the worst case scenario. Regardless of what may happen, let us first savor the moment, let us all enjoy it before it ends once again. Who knows? Maybe in the middle of the year or at the end of the year bitcoin will reach $100k, that would be the biggest and it will surely make noise all over the world.