I can't see this working out well. Probably only a small number of individuals could be resurrected, simply because of lack of good DNA samples, and I bet a lot of errors would be introduced in de-extinction given current tech.
Genetic diversity, therefore, in the de-extinct species would be incredibly poor and any second generation would likely be rather sickly and not resistant to diseases. Either that or a continuous and very difficult (impossible?) genetic engineering effort would have to be involved in restoring genetic diversity to the species.
Second, all of a species isn't exactly captured in just the DNA. DNA only gets expressed properly in the right cellular environment, it's a 'chicken and egg' problem. If you don't have a chicken egg, how do you raise a chicken with just the DNA and some other egg? Your other egg may not provide the right environment for correct genetic expression and you may end up with some sort of chimera of dubious viability and authenticity. Incompatible mitochondria are an obvious issue.
Third, given the first two, your de-extinct species is likely to simply go extinct again unless you correct the environmental issues that led to the first extinction. And given the rate at which we're screwing up the planet, is that really realistic?
I think it'd actually be better to devote resources to discovering and preserving as much as possible of DNA and related structures for future de-extinction attempts when technology is better and we've learned better planetary management.