Like many others, I'm sure that without Glenn there will not be another Eagles album.
However having heard Expando recently, I'm wondering if some or all of the other members could record an album together at some time. E.g. an album attributed to Henley/Schmit/Walsh album, perhaps with some Eagles 6th members such as Jackson Browne and/or JD Souther to make an even larger supergroup.
The combined efforts of all these members could easily come up with something really good. I'd like to see it happen, though I personally would prefer it wasn't credited to 'The Eagles'.