I hate that term "pump" when it's applied to bitcoin, and I want to pull my hair out every time I see someone writing it in a post, which is quite often.  It has its origins in the phrase pump and dump, which isn't applicable to bitcoin and I don't think many people even think about that fact.

Anyway, bitcoin is primarily an investment even if you think it's a currency that was designed to replace fiat (which I'm not sure is actually the case, OP).  That being the case, it's only natural that people are going to focus on how much it's worth in terms of fiat--which it isn't even close to replacing.  And even if it was used far more as a currency, its fiat value indicates its purchasing power so people would still be focused on bitcoin's price in terms of fiat.  The only thing that would change that is if items were priced in terms of bitcoin.  So far that hasn't happened, and even when things are priced in bitcoin, that price is usually always fluctuating because bitcoin's value (relative to fiat) is always fluctuating.

And me?  I'm happy with bitcoin being an investment more so than a currency, and it makes perfect sense that its fiat value is extremely important.