That is very true, anything that people think will raise in value tomorrow is perceived as a good investment, no matter the mechanics behind it.
That being said, whoever created bitcoin could have not anticipated it will ever be so popular, or at least not fast enough, maybe a PoC for the future. Even if that was the goal, there is no denial Blockchain technology and bitcoin per se have a lot of applications and utility, but yeah, the value it has now is completely not supported by the actual level of penetration and usage, so I believe 90% of it is speculation.