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Fluid movement between compartments is governed by osmotic gradients. When plasma becomes diluted, its solute concentration drops, lowering the osmolarity of the extracellular space. Intracellular fluid has a relatively higher osmolarity, so water is drawn into cells to balance the concentrations. Therefore, the fluid that moved from plasma into the interstitial space due to dilution is ultimately pulled into the cells, making the intracellular space the final destination. (Note: some interstitial fluid can be drained by lymphatics or reabsorbed into plasma over time, but the immediate fate driven by the dilution gradient is entry into cells.)