If you look at market share, we've already seen a convergence to USB devices that have 2 buttons and small screen (ledger and trezor). The vast majority of users are perfectly happy with that form factor.
But as someone actively working in this industry (at BitBox), I don't think we're in that converging phase just yet. It also depends on how much people are willing to pay for their hardware wallet. If you're limited to a $100 budget, there really isn't a crazy amount of new technology available that will let you build interesting devices.
I believe there's still a lot of room for so much creativity and exploration in the hardware wallet space.