Rephrasing the original question: if we can anticipate the guiding principles underlying the morality of the future, ought we apply those principles to our current circumstances to make decisions, supposing they are different? Though you seem to be implicitly assuming that the guiding principles don't change, merely the decisions, and those changed decisions are due to the closest implementable approximation of our guiding principles varying over time based on economic change. (Did I understand that right?)

Morality is contextual. If we have four people on a life boat and food for three, morality must provide a mechanism for deciding who gets the food. Suppose that decision is made, then Omega magically provides sufficient food for all - morality hasn't changed, only the decision that morality calls for. ---------------------------------------- Technological advancement has certainly caused moral change (consider society after introduction of the Pill). But having more resources does not, in itself, change what we think is right, only what we can actually achieve.