I shudder to think of the guild hall system being pasted over to individual housing. It's clunky, hard to place objects, impossible to 3D rotate objects, and prevents you from putting a number of things in close proximity. ANet has received a lot of feedback in the past on what makes for good housing; it is my fervent hope they have listened and are taking this long to give it to us because they are working up from scratch.
ESO housing is a shining example of how robust housing can be, how flexible, how creative. Even it has flaws, most lying in cost in gold/cash/mats being extremely high and item limits very low for the space given to fill, but GW2 guild halls are nowhere close to enough.
See other player housing threads through the years (you can search these forums for them, or check in the old forum archives) for deeper discussion.