One of the US Commanders has an ability to retreat vehicles off the map and get their fuel back (but not the manpower). It's not quite the same, and is limited to one commander, but it is in... sorta.
I don't think a feature like this would be inherently broken, it just needs some tweaking and adjustments to work. In World in Conflict you didn't get an immediate refund on the unit you removed, instead it was slowly recycled back into your funds over time. Something similar could be done in CoH2 by granting you a temporary income boost for a couple minutes until the cost (or percentage of that cost) was refunded.
you read my mind and that might work as long we get an option to remove units in field to free up pop cap as well as change force composition when the situation demands for it
ps. do you still play WiC i stopped after a while because of all the green weener noobs