If the Bitcoin blockchain would support 2000 transactions per second, how big would the blocks need to be (with segwit at 100% lets say), and most importantly, how much bandwidth would be necessary for a miner to propagate the blocks to 8 peers?
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The very question is, "Bitcoin can be support the 2000 transactions per second?" so I think to exist other component work on bitcoin for improving transaction speed – vincenzopalazzo Sep 10 '19 at 22:38
If you consider that Bitcoin currently does 2000 transactions each 10 minutes, you'll need blocks 600 times bigger, or more-or-less 1.2 GB each. Now you need bandwidth sufficient for that peer to transmit 9.6 GB each 10 minutes (1.2 GB * 8 peers -- I have no idea of what you meant by "necessary" bandwidth).
That's doable if you only have one miner in the entire network.
