In the unfortunate event that the FCC one day win and NN becomes distant memory, do you think BTC can survive?
Yes. It'll continue to thrive the same way as it is now.
Will it impact the mining community or do you think they will absorb the costs of paying for the highest quality internet service and pass the costs onto fees?
Mining doesn't consume much bandwidth. Anyone can run a miner with a decent internet connection. All the computational power comes from the ASIC chips only. Hence you don't need "highest quality" internet service.
Is BTC still reliant on mining to the point that its severely threatened if mining is lessened or because people aren't spending it atm and are mostly trading it instead do you think the impact won't be so great as it once might have been when BTC was in its ultimate infancy?
The network is highly decentralized now. There will be difficulty adjustments if the overall mining power is lessened but that doesn't quantify any threats.
Do you think we, as non-miners in the BTC community would have to pay for higher quality internet service to avoid lag-time on live charts and market movements?
No, we don't. Although there might be possibilities of companies such as Coinbase availing for faster lanes than other exchanges in order to gain more user-base but that's in theory for now. Will have to note how things pan out in due course.
Even more so because I am in the UK and I am unsure how the FCC enforcing the removal of NN would impact those beyond the US borders as well as those within the borders.
That depends on how effective the enforcing will be. In any case, that will have very less impact in the Bitcoin community.