I'm delighted Belle is gone, because now the "OMG ADELLE R SO CUTE, ADELLE 4EVA!!!!" phase is over, we can finally get back to pre-Adelle Aden, when he was much more interesting.
I find it funny you say that, because it seems to be we always say things like that, but genreally there aren't actually any fans of those specific couples running around saying it xD
For the show, Aden's had plenty of time to grieve. People were already starting to complain about how moody he is & would he realise other people are hurting too etc. and now people are starting to say he's too cheerful too fast, and hasn't had enough time to get over Belle... there really is no pleasing everyone.
Whilst not everyone is an Adelle fan, I think people are forgetting that Belle became his whole life; whether we like it or not. Even Aden has said it himself numerous times, things like [these aren't precise quotes though] "Belle died, and now I might as well be dead too" or "now that her life is over so is mien" - he literally gave up wanting to go on for a while, and, fan of Adelle or not, as general fans of the show, we can't be expected to just overlook that.
I imagine she'll still be present in the show for a while longer, in spirit/thought/reference, but, I'm happy to see Aden starting to go back to himself. Some of his recent scenes with Geoff have been excellent to watch.