I think Bluey makes a good point in stating that Red Dwarf no longer needs Holly. In fact i would personally suggest that that is more a fact than a personal opinion,...in my personal opinion at least However, needing, and the ability to fit in succesfully are potentially two very different things. But the latter very much depends on Dougs writing, and whether he is still 'feeling' the Holly character personally or not. If not, and rather he attemps to unaturally wedge the character back in just for sake of old traditions and pleasing us fans, then it is at risk of stagnantation and hense a potentially induced weekness for the show. I definately think Holly could still work well, and although i realise that what i'm about to say is seemingly an unpopular opinion, i personally enjoyed Holly's part in series 8 and feel that it worked fairly well over all. Although i admit some of the Holly gags are not up to earlier standards, which is certainly something to bare in mind. But i don't think the character felt out of place really, nor did it (to me at least) feel overly forced either. I'd say it's all in the writing as to how succesful or non succesful Holly can potentially be in modern day Red Dwarf.