Indeed. Most of mine can't be pulled through too easily, though it could be done. But it was cat 6 anyway.It really is a difficult one with the future proofing aspect, potentially some decent copper Cat5e is good for 10G, but currently it must be rare that 1Gb/Sec is fully utilised given hardware constraints at either end of the cables. I wired the house fully with 5e just over ten years ago, if I were starting from scratch now I'd go down the 6 route. I've got everything in trunking so changing to 6 wouldn't be too difficult as it could all be pulled through and changing sockets, patch panels and patch cables would be the biggest hassle but could probably be done over a weekend.
Even then, a 100gb 2 hour film uses what, 15% of a gig ethernet? I must future proof my house for 32k streaming!