It's possible they'll keep the Paypal running after the Kickstarter campaign is done, although they'll likely have different rewards available.
As for adding dungeon levels through Facebook (I hope this is what you mean), they've said that once the Kickstarter is over, they'll stop adding to the dungeon. So if we're short of 40,000 on Facebook nothing more will be added from that (although we're still going strong with backer numbers).