Since I thought this was the most appropriate place to say something about episodes last year, I wanted to comment on the choice Watanuki-kun made to be the successor of the shop.
If you read TRC along with this, the epilogue states that Watanuki-kun also chose to be the owner of the shop and be unable to leave the it because he is an entity that "shouldn't" exist. R!Syaoran made a similar choice by constantly changing worlds.
How does that come into play? I believe that in order to keep Yuuko's wish, to keep existing and live, he NEEDS to be the owner of the shop and never leave. Because if he ever leaves, he will surely disappear, and that would unfulfill Yuuko's wish. Regardless of the price he paid, he would've disappeared anyway. So he did this to make sure he does exist.
As to why his "time" has to be frozen, Watanuki's price was paid in part to keep the the universe's space-time logic to be normal. And also to fulfilll his personal wish, to meet and see Yuuko-san again. I do not think that the latter part of this is what Yuuko wanted, but she only wanted Watanuki to "live" as any other person would, not eternally wait for her because she cannot be resurrected.
So the continuation of this manga is this, to answer the question of whether Watanuki-kun made the right choice or not.