It would seem counterintuitive to bring out a new line of Slingerlands when there is a plentiful supply of the vintage "real deal" drums out there that can usually be purchased for much less than a new set. Yet Ludwig, Gretsch, and even DW face this same issue, lots of used product out there. Drums aren't generally a disposable item and most people take care of them pretty well so the population of quality used examples from each of those brands continues to grow year after year. Yet, somehow, they are all able to sell enough new drums annually to stay in business and even flourish. To me that indicates that a large percentage of drummers are enamored enough with "shiny new" or "latest and greatest" to shell out the money for new drums. So adding another flavor, Slingerland, might just be what some folks are looking for (depending on what DW does with the brand). I would guess they know what they are doing and it has always been evident that the two principals at DW have a genuine affection for vintage American drums. Figure Steve Maxwell is likely to get involved in some fashion and there is potential for some pretty neat stuff.
I have some vintage Slingerland sets and one Nashville set so my needs are covered many times over but a brand new Radio King snare built to high standards would hold some appeal to me if the price isn't crazy high.
Pricing will be the trick here. Ultra high prices and poor distribution is what killed off the Gibson Slingerlands. Make it too much of a premium brand and people will stick with their vintage ones and nothing else. Conversely turn them into a mid-line or lower brand will likely kill them off as well unless coupled to higher end versions that the buyers of the cheaper ones can aspire to own eventually.