don't worry you can get 4gb , ethereum will be in proof of stack before dag come (middle or end 2018) to 4gb + 8gb is for gaming ... just a bit better (some cards) with core for zcash for exemple
You can use 4GB card for a long period do not worry, you can use DAG file calc to find out the hit date of 4GB GPUs ( now it is 2022 year) Dag size calc is here : https://investoon.com/tools/dag_size
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Dag size calc is here : https://investoon.com/tools/dag_size