Not quite on the same scale but before the Raspberry Pi came along it was thought that Risk / Arm were just very specailised, since then the number of Arm based single board computers has increased hugely. I am not sure if the Pi can be fully attributed to this, but it did start something.
Upto then, Intel / Amd processors were the main choice for computers.
Of course phones had a lot to do with this too, but phones and tablets to me are different to desktop computers.
I probably need some clarity help here, but lets start a conversation perhaps.