The block size limit is not the same as real block size. Even if you remove the limit, it does not mean miners will mine 100MB blocks, there will not be so many transactions with fee in 10 minutes. Attackers can send 100MB blocks but that will be rejected by miners immediately

I don't think we have ever reached the network bandwidth bottleneck. With an average 70% increase in transaction volume per year, the network will be fine at least for another 5 years, and by that time, 4K/8K TV rolling out will make the average home bandwidth jump to 1Gbps to be able to get 8K live broadcast

And the transaction volume can not keep growing like that forever. Once you reached hundred TPS, then the growth will be significantly slower due to market saturation (Many people would never use bitcoin, even if they are IT experts, they just had a holy view for fiat money)