Yes it is they should come back...there is still a market for them,as you know there were some brands like the Sandford museum and Gaso.Line that made new models from old castings and new paint/camo patterns etc.
There are still a vast number of models to be produced from their old metal hulls and turrets...the wheels and tracks however are another matter as they were made to be toys,with working movable tracks...these days that is no longer a must,as these are mostly bought by us...and collectors...if they made new sets of tracks and wheels they could go one step closer to the Corgi quality.