It wasn't too hard or expensive to get used 10 gigabit cards for my router and server. It was a bit pricier to get a used Thunderbolt 10 gigabit adapter for my Mac, but still not prohibitive.
I thought I was really future-proofing by making my house 10 gigabit compatible when I only have 2 gigabit internet, but if I have to worry about 25 gigabit internet everywhere I think I think I give up!