A Localiser/DME approach is an option should only the glideslope fail, using DME distances to determine what height you should be at (which you should be cross-checking anyway). Operators SOP's will no doubt detail the criteria for this though.
Out of interest, what is the usual height that you would be able to transition to this type of approach if the glideslope needle disappears (without having to carry out the missed approach and start again)?