no, I don't think this is just a bubble because people are actually taking big steps with bitcoin and as it is increasing its price day by day people are really understanding its good side. but I am afraid there are still 70% users in bitcoin who do not know about the dark side of the internet and how much bitcoin is being used there daily.
It's deffinetely bubble. Governments are taking steps toward to btc, and there are lots of news from all over the world not only internet but also in media too more than ever. So they are creating this bubble for bitcoin, even people with no idea what bitcoin is up until yesterday asking me about bitcoins and what most of them says like "Hey I heard about bitcoin, they say you can make money out of it, do you think if I invest some I can earn to?". And when I ask simple questions to them about did you ever searched what bitcoin is, how does it work and etc. they have no answer, they are just coming with hearsay information. Also you know what, there a lot of them buying bitcoins without knowing what it is just for earning easy money and when the market shakes a little, they are dropping like leaves of the tree in the autumn. As for the bitcoin gold, its totaly scam fork which is premined and coming to market for the sole purpose of making free money to its developers and people actually falling for that. It's such a sad thing.
for more info about bitcoin gold scam:
https://www.reddit.com/r/CryptoCurrency/comments/757jf4/here_is_why_bitcoingold_is_shady_and_a_scam_you/