finaly we should sell our 4GB graphic cards or we can mine ETH in future?
This is good idea , but how can you sell 50+ or 100+ those GPUs ?
for its weight ?

Ive switched for 8Gb in a couple of rigs but its so hard to find more or less convinient deal

no body say right that what we should do and also im not sure that mine with 4GB graphic cards will be imposible!