Imagine if they had survived. They'd have lived in exile somewhere, not in the same style to which they were accustomed. England was uncomfortable with the idea of Romanovs living there. Other nations as well, for political reasons.
And they would have had thousands of desperate refugees petitioning them constantly, trying to continue living in the past....who would the family trust? Who would be left with the finances and social stature to be able to marry the daughter of the exiled czar? What royal family would have welcomed a daughter by marriage?
I think it would have been difficult.....