A point of clarification: trade publishers in the West do not take away an author's copyright. They instead pay—via advances and royalties—for the exclusive use of your copyright. Unless they contract you for a work-for-hire, in which case they pay an upfront sum (calculated by how much they believe the book would make over its life span) and own the copyright.
In the US, at least, the copyright returns to the author after thirty-five years regardless of whether or not an end date is noted in the contract.
From what I have seen of the contract offered here, you will lose the ownership of your copyright. As well as be tied up with the rights of first refusal.
I would caution that, while WN hasn’t enforced some of the items in their contracts, as mentioned above, that doesn’t mean they won’t in the future. When signing a contract, it is best not to assume the other party will not excercise the rights granted via the contract. There have been many authors in trade publishing who took such gambles—some were fine, but in other cases, they were caught flat-footed when the publisher went ahead and exercised those rights.