Is the idea to essentially launch a DPOS PTS DAC and promote it as currency rather than sharedrop instrument?
It could be both. The honest truth is that Nxt was lightyears ahead of every other crypto until Bitshares launched, but they had only marginal success. Ask yourself why. To this day, Nxt has features that Bitshares hasn't implemented (multi-gateway trustless exchange between BTC-NXT/BTC-LTC/BTC-DOGE and digital goods store come to mind). No matter how superior they were in features and functionality, they could not overcome the stigma associated with their flawed IPO. Bitshares is better, but is it good enough? Time will tell. My argument is that a "purist" version of DPOS has a fighting chance for mass adoption, maybe even a better chance than a feature rich coin with a fumbled allocation problem and variable inflation (superDAC).
As for the second part of your question, I would also argue that such a "purist" DPOS coin is also ideally suited for sharedropping by the "feature-rich" coins. If it weren't for Gavin, I personally think Vitalik would have share-dropped to PTS/AGS for Ethereum. I think neither Vitalik nor Gavin nor any other rational developer would sharedrop to the superDAC. The ideal instrument for sharedropping is a fairly launched pure proof of work coin with no premine. This is PTS by definition. The same properties that make PTS well suited for currency also make it an ideal instrument for sharedropping/distribution by feature-based coins.