I mean, this is essentially the same things as just upping the item limit of homes by that amount. Either way the game has to populate an additional 400 items or whatever.
I think a better solution would be to roll out a station like the transmute station with a menu the same as the reconstruction menu, where you go into it, pull up the set and item and quality you want and hit the button and it's made. Then everyone would just have to have one item and guild halls could be decorated out further with their existing limits. It would also offer the ability to have smaller crafting homes for some smaller guilds or players since they'd only need one item.
The only thing that leaves as a problem is what to do with all the existing tables that people already invested in. I guess you could use them to 'fuse' into the new station to add the ability to craft the set into it, but you would still end up with people having a lot of stations in storage. I mean if zos was really cool, they could look to see who has a home with every set already in it and give the owner a free 'mega' station and then only newer builders would need to invest in the new station.