PCI-e or what ever option they decide to use this is still IMO not a good option for one reason. The cost is to high. The only way you would ever go this route is if you have an older laptop you want to upgrade I guess. If you have not purchased one yet your can get a good gaming laptop for the price of and avg laptop+VI dock+the GPU. So that markets out even so If you have an older laptop you would be better off just saving your money for when you can buy a newer gaming laptop or better yet just build a desk top. So really the only way this makes any sense is if you have an older laptop live in a dorm room and 100% can not wait to play some new game that comes out.THERE'S been around since 2001 external pci-e specifications with cables etc and with some implementations in several areas. external pci-e is the way to go. no way thunderbolt has the necessary bandwidth.
notebook manufactures earn waay more profit selling new notebooks then just selling external graphic upgrades.
the problem here is in the interface. vidock can make use of thunderbolt because many new notebooks will come with thunderbolt.
but the only solution is to use an external pci-e connector. and vidock doesn't make notebooks and no notebook will be made with this kind of connector.
this problem will never be solved because of the greedy notebook manufactures.
If only 1 notebook was released with this kind of capability then the other brands would follow immediately to avoid losing market share.
external pci-e is not like something that needs to be developed or that needs to be worked to be implemented. it's been around since many years ago, much older then thunderbolt. there's no excuse to not implement it.