>>15651300
Supply and demand. The value will be determined by speculation on the usage of the network.
More usage = more requesters paying node operators for jobs, meaning the have to purchase link to run their jobs
More jobs being run = more buying pressure, combined with more bulls speculating on network usage and future buying pressure.
Then there's staking. More LINK being staked = less LINK being sold on the open market. Moreover, the entities staking LINK are keen to be optimistic about the tokens value, since the payment for their past jobs technically increase as the price goes up, these people are more inclined to hold.