Dovin isn't the most underwhelming planeswalker in the set — that award goes to Kaya instead. Many players don't even consider it a main deck card, which is understandable.
Sideboard cards like this almost always end up on the lowest market shelves amongst the rest of cheap planeswalkers, costing in the range of $1 to $2.
However, Modern players may find this card more interesting than Standard enthusiasts. It does deal with early Aether Vials, which is a bane of the Modern format, so there is some room for a price increase here. That said, don't expect much from this planeswalker after release.