We all would. However, there is a new GDI tank already modeled/developed and is able to detect stealth set to premiere later on in the year after testing. It might be the leopard 2...
I for one vote for the Tiger 1 / 2 as it's an awesome tank. However, this mod is almost entirely one man who is quite busy with life. The fact we're here is quite amazing in my opinion and these things take time. Kaskins/dblaney have developed all these maps (And recently vile facility) , vehicles, adjustments/balances and such like ships. So it's quite alot to do.
The good news however, is there is a new drone R/C unit about to be input in the game for scouting and to drive around (it's awesome). A new patch was just put out. Also if you're looking for some German WW2 Tankage.. the O-13 something from the forgotten war factory is actually the Hetzer Tank irl.
Nod also has a bunch of WW2 Tanks. They are however so ineffective late game (or after 5 minutes honestly) that modeling more is just a gimmick if anything. The gun on a Tiger (88mm) is pathetic compared with anything this game has. In addition, the engine is slow, and it's armor I don't think was ever designed to stand up to dual 120mm Railguns. To model a unit which almost sees no use in reality besides "wow, this is cool!" then *Novelty worn off. Whatever* is not as good of a usage of time than making actual new units/weapons and models for the game that greatly can affect gameplay.