The price of storage is exponentially getting cheaper and the 1K GB would be the theoretical maximum growth.... or not going to happen for at least a few more years.  Additionally, there are attempts to work on merkle tree pruning and other solutions to reduce blockchain bloat.

The reason this is important now is because their are some blocks that already are completly full at the 1MB limit. we don't want this to become the norm and have transaction fees skyrocket and confirmation times becoming 2-3 times longer.