Not me what would be anticlimactic would be following these two for over a hundred chapters just for things to end between them in such a short amount of time.
Anticlimatic was the wrong term but it woud not feel plausible after everything happened.For me to Sakura at least try again she would have to suffer,cry,beg for Shinobu's forgiveness and them start a redemption development.
For me it would like it with these development:
"Ahahahah Hey Shinobu!i cheated on you but i still love you!!ahahahahah"
"Ahahahah Sakura you naughty girl! I love you too!!!"
For me is not enough,for me is not that plausible and for me is not a ending that Sakura deserves.Her moving on and improve herself is way better ending for her.That ending would only be possible due plot convienience and forced thing happen.
And with that we have to destroy Fumi that was way better option for Shinobu just to please the FMC.