Transaction volume is very clearly rising exponentially. Sooner or later prices will catch up.
Lets say that is true that transaction volume is rising exponentially, although the last year it is not clear... and 100% increase Y/Y for a game changing innovation is not a lot... (also lower highs for the last half year).
According to Peter R's interpretation of Metcalfe's Law, to support the historical 10x annual average growth in bitcoin prices, transaction volume needs to grow an average of 3.2x annually. We are not there yet - but the last 30 days might just resume the historical trend.
It's more likey that we could see an uptick in network transactions in response to this gradual erosion in support of a >$600 price, as there are now more ways to spend bitcoin than ever. Previous price slides didn't necessarily contribute to transaction volume as much as they could in this environment of more diverse retail acceptance, there will have been many speculators that had their BTC already in their exchange accounts, only to be transferred off-chain to someone who behaved the same as them (which, of course, adds zero to the network transaction volume).
While previous sell-offs could fit a profile of somewhere between 0 and 1.5 transactions for every individual divestment event, the present circumstances could be in the range of 2 and 5 transactions per divestment (to account for the greater number of parties involved in the event overall, i.e. seller > processor > merchant > broker > investor)
There's a suggestion that this is true in the figures; gross volume in dollars of transactions has declined, yet actual frequency of transactions is still in the 50K-70K/day range. A higher frequency of small value transactions than perhaps there's ever been.