During the Q&A session for the fiscal year ending March 31, 2019, an investor asked Nintendo whether they had any success in raising engagement rates for Nintendo Switch games that are already released.
Nintendo President Shuntaro Furukawa told the investor that they have indeed seen success by releasing DLC and free updates for various Switch titles to boost engagement rates that have fallen. An example he cited was Super Smash Bros. Ultimate, but this should apply to pretty much every other game that continually receives updates like Mario Tennis Aces and Splatoon 2.
Read his full words below:
TETRIS® 99 has helped maintain Nintendo Switch engagement, as well as increase the number of new members joining Nintendo Switch Online. And when we add new titles to Nintendo Entertainment System ‒ Nintendo Switch Online, one of the services available to Nintendo Switch Online members, we see consumers returning to play on Nintendo Switch. As for individual titles, we released the first add-on content just the other day for Super Smash Bros. Ultimate, to give one example. The release of add-on content and updates like this is proven to raise engagement rates again that may have temporarily dropped.