If they hadn´t stand their ground, the Russians had entered Germany much earlier!
If this is in relation to Courland I think your mistaken.
The usual arguement is that it tied down Russian forces-Well yes that is true but what quantative effect did this have on Russia's ability to enter Germany, argueably none. It was more a case of Russian tunnel vision if you like that they would destroy this German force on it's land (Post'39)
The Russians might as awell have left just a minor force to defend the perimeter, because what could the German forces do from there?. They could attack but where to and for what goal that could be held against overwhelming force that Russia could bring to bear.
Better that the troops were along the Oder etc. Yes they wouldn't have staved of the deafeat but Germany would have kept going a bit longer.