I think it's mostly a matter of "momentum"... if other things happen along with the halving, the price would rise and shine to follow the lesser profitability (thus attracting more miners as well, increasing diff, keeping the momentum going). Those things usually have a tendency to balance themselves...

I'm definitely curious to see what halving will do with uPlexa and I'll be closely following the haps.

As far as "use case" is concerned, all the "tools" are ready (payment gateways & plugins for all the major opensource e-commerce platforms), now I guess it's a matter of promoting the use of UPX amongst our own community and to a wider audience. The uPlexa Team has been working in e-commerce for a long time already, so I'm pretty sure they'll come up with something (aka partnerships).

Of course this all has to be integrated in that "momentum"...With the current price I'm guessing very few potential shops would want to integrate UPX payment now (asking for thousands of coins to pay for a usb stick wouldn't look so good from a pure psychological point of view).