I think it is too soon. Citi implemented this as part of a general insurance benefit refresh in mid-May. That's only about three months ago. Citi has also not done much marketing to increase cardholder awareness of this specific benefit.
The reason Citi extended the coverage is to reduce churn. To use the benefit you must keep the card open for the entire duration of the warranty. If this reduces card account cancellations you can be confident that the other issuers will follow.
Thank you. You make good points.
Could you clarify whether for CHASE cards one still needs to be a cardholder at the point in time the warranty is exercised? Chase only offers 12 months extra warranty, but will you still get the warranty if you buy the item when you are a Chase card holder, but when the extended wararnty is actually exercised (i.e., you file a claim) you are no longer that specific cardholder?