Hull Sec 3.6 Stack and Roll

[Hello_World]

In the above section, the author said the following.

"The oil price declined from $89 to $86. Receiving only $1.70 per barrel compensation for a price decline of $3.00 may appear unsatisfactory. However, we cannot expect total compensation for a price decline when futures prices are below spot prices. The best we can hope for is to lock in the futures price that would apply to a June 2015 contract if it were actively traded."​

For the highlighted sentence, what does the author want to say? Could anyone help clarify, please? Thank you!