I'm a proud owner of a 1 Gbit/s fiber connection with a 100 Mbit (wired) network in my house. I want to upgrade it to match, but I don't want to go through the effort because I never run into download times for anything.
I have 10gbit service, 1gb internal network. So like you, but 1 generation forward.
I don't usually saturate 1gbps, but I definitely saturate 100mbps with XBOX downloads, any cloud provider, torrents, etc.
You could probably pull your old cables fairly easily. Attach two wire pull tapes or strings to the old cable, pull the old cable out with plenty of wire pulling lubricant, and then use one tape/string to pull a Cat 7, leaving a spare for mistakes or additional pulls.
Do yourself a favor: buy some fiber cables, two switches and connect both ends like that. This is the only way to "future proof" it (past 1 Gbps) and will avoid you pulling cables for a while - I hope.
You can make it work with 2.5GbE and maybe even 10 GbE with some luck. But looking at its current state and price I personally would agree that fiber is more future proof.
OG Cat 5 (non-e) I take it? That is such a pain to redo, I rewired some of that myself and it was a drag. If my job weren't being the literal network guy I probably would have stuck with just using Wi-Fi too!
I don't usually saturate 1gbps, but I definitely saturate 100mbps with XBOX downloads, any cloud provider, torrents, etc.
You could probably pull your old cables fairly easily. Attach two wire pull tapes or strings to the old cable, pull the old cable out with plenty of wire pulling lubricant, and then use one tape/string to pull a Cat 7, leaving a spare for mistakes or additional pulls.