TBF they should be entitled to object if they have a concern. It is then up to the applicant to show in their operating plan (which has to be submitted as part of a licence application) how it will deal with the concerns raised by objectors. The licencing team then decide whether the objections are valid, and if they are valid whether the applicant's operating plan deals satisfactorily with the issues raised.
Objecting to a licence is not just about making sure they do not get one at all but also about negotiating on operational conditions - e.g. operating hours, sound proofing (particularly important if you live upstairs and they plan to have music into the night which Cafe au Lait did not), where smoking areas are, etc.. If neighbours don't deal with concerns at this stage they then have to implement a full licence review at a later stage to deal with the most minor problems.
I'll be surprised if they don't get the licence, albeit with some conditions attached. If they don't it should not be viewed as a disaster since Khan's does very well without a licence. I'm not sure that a barrage of emails of support would make much difference (although it surely won't hurt) since the objectors concerns will still have to be dealt with in the same way.
(Someone who knows more might be able to point out if I am confusing different types of licence?)
Might wander up (with a bottle) tonight.