No. The modulation and time sharing built into 5G only offers 15-20% increase in bandwidth available, MHz for MHz, when compared to 4G LTE. This is not a significant increase. It is not at all like the 3-4x increases in bandwidth, MHz for MHz, that the jump from 3G modulations to 4G LTE did.
Almost all of any potential increase in total speed will have to come from using new parts of the electromagnetic spectrum. To that end the FCC is kicking out old users from the 3 GHz range and auctioning it off to the mobile telcos. This includes both the traditional backend media distribution role and completely eliminating the amateur radio alloacations (ref: https://docs.fcc.gov/public/attachments/DOC-360941A1.pdf).
But even with stealing bandwidth from you, me, and the normal media companies it won't replace an ISP with wire. Why? Every single wire or fiber has as much bandwidth to itself as the entire electromagnetic spectrum useable in freespace. And you don't have to share. Wireless, no matter the modulation, can never replace wired ISPs simply because there's not enough spectrum for everyone to use it at once.
Additionally, the 3-4 GHz spectrum really doesn't have that good of propagation characteristics. And mm-wave, well, that's about as effective as a light post light in terms of coverage area.
No, 5G will not destroy any monopolies. That's silly.