To be specific, fully 88%(!) of miners are actively signaling support for the upgrade plan known as "segwit2x".[1] The contention was between whether Bitcoin should scale via block growth or via a different transaction serialization format that allowed for more transactions and also opens the door for certain forms of off-chain transaction. Segwit2x does both: it doubles the block size, and introduces the new transaction serialization format.
This should result in an immediate transaction capacity increase of at least ~3x. On top of this, the new transaction serialization format allows for technologies such as the in-progress "lightning network", which allows for very very substantial transaction volume off-blockchain. (Think on the order of thousands of times higher volume at the very least. Probably on the order of millions is attainable.)